Payal Taya, V. Singh, D. Jana, R. Tyagi, T. Sharma
Photoluminescence (PL) and Photoluminescence Excitation (PLE) measurements are performed on MOVPE grown InAlN/AlN/InGaN/GaN/Sapphire High Electron Mobility Transistor Structures. Features associated with InAlN barrier layer, InGaN channel layer and GaN buffer layer are clearly seen in the PL spectra. A blueshift of PL features with excitation intensity is observed which is claimed to be the signature of 2-dimensional electron gas formed in InGaN layer. By comparing the integrated intensity of PL peaks recorded at 7K and room temperature, it is confirmed that the optical quality of InGaN and GaN layers is superior when compared with that of InAlN barrier layer in the HEMT structure. It is also seen that the PLE features of InGaN channel layer are considerably red shifted with respect to PL features of the same layer. It is explained by considering the screening of polarization induced electric field causing a blue shift in case of PL measurements.Photoluminescence (PL) and Photoluminescence Excitation (PLE) measurements are performed on MOVPE grown InAlN/AlN/InGaN/GaN/Sapphire High Electron Mobility Transistor Structures. Features associated with InAlN barrier layer, InGaN channel layer and GaN buffer layer are clearly seen in the PL spectra. A blueshift of PL features with excitation intensity is observed which is claimed to be the signature of 2-dimensional electron gas formed in InGaN layer. By comparing the integrated intensity of PL peaks recorded at 7K and room temperature, it is confirmed that the optical quality of InGaN and GaN layers is superior when compared with that of InAlN barrier layer in the HEMT structure. It is also seen that the PLE features of InGaN channel layer are considerably red shifted with respect to PL features of the same layer. It is explained by considering the screening of polarization induced electric field causing a blue shift in case of PL measurements.
{"title":"Optical characterization of InAlN/AlN/InGaN/GaN/sapphire high electron mobility transistor structures","authors":"Payal Taya, V. Singh, D. Jana, R. Tyagi, T. Sharma","doi":"10.1063/1.5113306","DOIUrl":"https://doi.org/10.1063/1.5113306","url":null,"abstract":"Photoluminescence (PL) and Photoluminescence Excitation (PLE) measurements are performed on MOVPE grown InAlN/AlN/InGaN/GaN/Sapphire High Electron Mobility Transistor Structures. Features associated with InAlN barrier layer, InGaN channel layer and GaN buffer layer are clearly seen in the PL spectra. A blueshift of PL features with excitation intensity is observed which is claimed to be the signature of 2-dimensional electron gas formed in InGaN layer. By comparing the integrated intensity of PL peaks recorded at 7K and room temperature, it is confirmed that the optical quality of InGaN and GaN layers is superior when compared with that of InAlN barrier layer in the HEMT structure. It is also seen that the PLE features of InGaN channel layer are considerably red shifted with respect to PL features of the same layer. It is explained by considering the screening of polarization induced electric field causing a blue shift in case of PL measurements.Photoluminescence (PL) and Photoluminescence Excitation (PLE) measurements are performed on MOVPE grown InAlN/AlN/InGaN/GaN/Sapphire High Electron Mobility Transistor Structures. Features associated with InAlN barrier layer, InGaN channel layer and GaN buffer layer are clearly seen in the PL spectra. A blueshift of PL features with excitation intensity is observed which is claimed to be the signature of 2-dimensional electron gas formed in InGaN layer. By comparing the integrated intensity of PL peaks recorded at 7K and room temperature, it is confirmed that the optical quality of InGaN and GaN layers is superior when compared with that of InAlN barrier layer in the HEMT structure. It is also seen that the PLE features of InGaN channel layer are considerably red shifted with respect to PL features of the same layer. It is explained by considering the screening of polarization induced electric field causing a blue shift in case of PL measurements.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78322518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. Santhoshkumar, P. LokeswaraRao, K. Ramanathan, A. Bera, B. Pahari
Recently it has been reported that low levels of Bi nonstoichiometry (only ±1 atomic %) in the nominal starting composition of Na0.5Bi0.5TiO3 (NBT) ceramics can lead to dramatic changes in the conduction property. Present article present the results of powder XRD, 23Na MAS NMR and impedance spectroscopy in nominal starting compositions, Na0.5Bi0.5+xTiO3+3x/2 with x = 0.0 and − 0.02. Room temperature XRD data analysis indicates both NBTs have a rhombohedral (space group R3c) structure. While, 23Na MAS NMR results demonstrate a complex local structure and significant disordering of Na coordination environment. Impedance spectroscopy reveals high levels of oxide-ion conduction in NBT. 2 at-% Bi-deficient NBT (Na0.5Bi0.48TiO2.97) exhibits higher conductivity of σ∼1.3 × 10−4 S/cm at 500 °C and activation energy, Ea = 0.85 eV. Present results therefore substantiate the A-site nonstoichiometry sensitive electrical property of NBT.Recently it has been reported that low levels of Bi nonstoichiometry (only ±1 atomic %) in the nominal starting composition of Na0.5Bi0.5TiO3 (NBT) ceramics can lead to dramatic changes in the conduction property. Present article present the results of powder XRD, 23Na MAS NMR and impedance spectroscopy in nominal starting compositions, Na0.5Bi0.5+xTiO3+3x/2 with x = 0.0 and − 0.02. Room temperature XRD data analysis indicates both NBTs have a rhombohedral (space group R3c) structure. While, 23Na MAS NMR results demonstrate a complex local structure and significant disordering of Na coordination environment. Impedance spectroscopy reveals high levels of oxide-ion conduction in NBT. 2 at-% Bi-deficient NBT (Na0.5Bi0.48TiO2.97) exhibits higher conductivity of σ∼1.3 × 10−4 S/cm at 500 °C and activation energy, Ea = 0.85 eV. Present results therefore substantiate the A-site nonstoichiometry sensitive electrical property of NBT.
{"title":"Important influence of Bi deficiency on the conducting property of Na0.5Bi0.5TiO3 perovskite oxide","authors":"B. Santhoshkumar, P. LokeswaraRao, K. Ramanathan, A. Bera, B. Pahari","doi":"10.1063/1.5113409","DOIUrl":"https://doi.org/10.1063/1.5113409","url":null,"abstract":"Recently it has been reported that low levels of Bi nonstoichiometry (only ±1 atomic %) in the nominal starting composition of Na0.5Bi0.5TiO3 (NBT) ceramics can lead to dramatic changes in the conduction property. Present article present the results of powder XRD, 23Na MAS NMR and impedance spectroscopy in nominal starting compositions, Na0.5Bi0.5+xTiO3+3x/2 with x = 0.0 and − 0.02. Room temperature XRD data analysis indicates both NBTs have a rhombohedral (space group R3c) structure. While, 23Na MAS NMR results demonstrate a complex local structure and significant disordering of Na coordination environment. Impedance spectroscopy reveals high levels of oxide-ion conduction in NBT. 2 at-% Bi-deficient NBT (Na0.5Bi0.48TiO2.97) exhibits higher conductivity of σ∼1.3 × 10−4 S/cm at 500 °C and activation energy, Ea = 0.85 eV. Present results therefore substantiate the A-site nonstoichiometry sensitive electrical property of NBT.Recently it has been reported that low levels of Bi nonstoichiometry (only ±1 atomic %) in the nominal starting composition of Na0.5Bi0.5TiO3 (NBT) ceramics can lead to dramatic changes in the conduction property. Present article present the results of powder XRD, 23Na MAS NMR and impedance spectroscopy in nominal starting compositions, Na0.5Bi0.5+xTiO3+3x/2 with x = 0.0 and − 0.02. Room temperature XRD data analysis indicates both NBTs have a rhombohedral (space group R3c) structure. While, 23Na MAS NMR results demonstrate a complex local structure and significant disordering of Na coordination environment. Impedance spectroscopy reveals high levels of oxide-ion conduction in NBT. 2 at-% Bi-deficient NBT (Na0.5Bi0.48TiO2.97) exhibits higher conductivity of σ∼1.3 × 10−4 S/cm at 500 °C and activation energy, Ea = 0.85 eV. Present results therefore substantiate the A-site nonstoichiometry sensitive electrical property of NBT.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"118 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78635242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, nanoplatelets of Bi2WO6 were synthesized by facile co-precipitation method followed by physical processing of the precipitate using ultrasonic waves. The X-Ray diffraction (XRD) results confirmed the orthorhombic structure of Bi2WO6, whereas the field emission scanning electron microscopy (FESEM) images revealed nanoplatelet morphology. Chemical analysis was done using X-ray photoelectron spectroscopy (XPS). Thus formation mechanism Bi2WO6 nanoplatelets (NPs) by the method of co-precipitation coupled with ultrasonic waves has been discussed. Gas sensing property of as synthesized Bi2WO6 nanoplatelets was analysed using hydrogen as target gas, a first of its kind. Interestingly a significant decrease in operating temperature was noticed when compared to the available reports for which the mechanism has been demonstrated.In this work, nanoplatelets of Bi2WO6 were synthesized by facile co-precipitation method followed by physical processing of the precipitate using ultrasonic waves. The X-Ray diffraction (XRD) results confirmed the orthorhombic structure of Bi2WO6, whereas the field emission scanning electron microscopy (FESEM) images revealed nanoplatelet morphology. Chemical analysis was done using X-ray photoelectron spectroscopy (XPS). Thus formation mechanism Bi2WO6 nanoplatelets (NPs) by the method of co-precipitation coupled with ultrasonic waves has been discussed. Gas sensing property of as synthesized Bi2WO6 nanoplatelets was analysed using hydrogen as target gas, a first of its kind. Interestingly a significant decrease in operating temperature was noticed when compared to the available reports for which the mechanism has been demonstrated.
{"title":"Conductometric sensing characteristics of nanoplatelet Bi2WO6 as nanosensor for hydrogen detection","authors":"R. Radha, R. A. Rakkesh, S. Balakumar","doi":"10.1063/1.5113156","DOIUrl":"https://doi.org/10.1063/1.5113156","url":null,"abstract":"In this work, nanoplatelets of Bi2WO6 were synthesized by facile co-precipitation method followed by physical processing of the precipitate using ultrasonic waves. The X-Ray diffraction (XRD) results confirmed the orthorhombic structure of Bi2WO6, whereas the field emission scanning electron microscopy (FESEM) images revealed nanoplatelet morphology. Chemical analysis was done using X-ray photoelectron spectroscopy (XPS). Thus formation mechanism Bi2WO6 nanoplatelets (NPs) by the method of co-precipitation coupled with ultrasonic waves has been discussed. Gas sensing property of as synthesized Bi2WO6 nanoplatelets was analysed using hydrogen as target gas, a first of its kind. Interestingly a significant decrease in operating temperature was noticed when compared to the available reports for which the mechanism has been demonstrated.In this work, nanoplatelets of Bi2WO6 were synthesized by facile co-precipitation method followed by physical processing of the precipitate using ultrasonic waves. The X-Ray diffraction (XRD) results confirmed the orthorhombic structure of Bi2WO6, whereas the field emission scanning electron microscopy (FESEM) images revealed nanoplatelet morphology. Chemical analysis was done using X-ray photoelectron spectroscopy (XPS). Thus formation mechanism Bi2WO6 nanoplatelets (NPs) by the method of co-precipitation coupled with ultrasonic waves has been discussed. Gas sensing property of as synthesized Bi2WO6 nanoplatelets was analysed using hydrogen as target gas, a first of its kind. Interestingly a significant decrease in operating temperature was noticed when compared to the available reports for which the mechanism has been demonstrated.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77643291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, we present the magnetic response of the flow properties of water based and paraffin oil based Ba-Sr ferrite ferrofluids. The platelet particles act as tiny magnetic discs in the ferrofluids and these ferrofluids are promising fluids for obtaining the better flow control in the presence of magnetic field. The nanoparticles of composition of Ba0.8Sr0.2Fe12O19(BSM) were synthesized by hydrothermal synthesis. The single phase magnetoplumbite structure is observed from the X-ray diffraction pattern of the platelet particles. The hexagonal disc of 5 to 7 nm thickness and 50 to 250 nm in size are seen in the field emission electron microscope and transmission electron microscope micrographs. The magnetization plots show ferromagnetic behavior of the nanoparticles. The magneto-viscosity show high variation in the low field range due to the chain formation of the suspensions in the ferrofluid. The flow curves exhibit power law variation with shear rate at applied magnetic fields.In this work, we present the magnetic response of the flow properties of water based and paraffin oil based Ba-Sr ferrite ferrofluids. The platelet particles act as tiny magnetic discs in the ferrofluids and these ferrofluids are promising fluids for obtaining the better flow control in the presence of magnetic field. The nanoparticles of composition of Ba0.8Sr0.2Fe12O19(BSM) were synthesized by hydrothermal synthesis. The single phase magnetoplumbite structure is observed from the X-ray diffraction pattern of the platelet particles. The hexagonal disc of 5 to 7 nm thickness and 50 to 250 nm in size are seen in the field emission electron microscope and transmission electron microscope micrographs. The magnetization plots show ferromagnetic behavior of the nanoparticles. The magneto-viscosity show high variation in the low field range due to the chain formation of the suspensions in the ferrofluid. The flow curves exhibit power law variation with shear rate at applied magnetic fields.
{"title":"Magneto-viscosity of platelet shaped Ba-Sr ferrite nanoparticles based ferrofluid in different colloids","authors":"N. Gautam, Rajender Singh","doi":"10.1063/1.5112992","DOIUrl":"https://doi.org/10.1063/1.5112992","url":null,"abstract":"In this work, we present the magnetic response of the flow properties of water based and paraffin oil based Ba-Sr ferrite ferrofluids. The platelet particles act as tiny magnetic discs in the ferrofluids and these ferrofluids are promising fluids for obtaining the better flow control in the presence of magnetic field. The nanoparticles of composition of Ba0.8Sr0.2Fe12O19(BSM) were synthesized by hydrothermal synthesis. The single phase magnetoplumbite structure is observed from the X-ray diffraction pattern of the platelet particles. The hexagonal disc of 5 to 7 nm thickness and 50 to 250 nm in size are seen in the field emission electron microscope and transmission electron microscope micrographs. The magnetization plots show ferromagnetic behavior of the nanoparticles. The magneto-viscosity show high variation in the low field range due to the chain formation of the suspensions in the ferrofluid. The flow curves exhibit power law variation with shear rate at applied magnetic fields.In this work, we present the magnetic response of the flow properties of water based and paraffin oil based Ba-Sr ferrite ferrofluids. The platelet particles act as tiny magnetic discs in the ferrofluids and these ferrofluids are promising fluids for obtaining the better flow control in the presence of magnetic field. The nanoparticles of composition of Ba0.8Sr0.2Fe12O19(BSM) were synthesized by hydrothermal synthesis. The single phase magnetoplumbite structure is observed from the X-ray diffraction pattern of the platelet particles. The hexagonal disc of 5 to 7 nm thickness and 50 to 250 nm in size are seen in the field emission electron microscope and transmission electron microscope micrographs. The magnetization plots show ferromagnetic behavior of the nanoparticles. The magneto-viscosity show high variation in the low field range due to the chain formation of the suspensions in the ferrofluid. The flow curves exhibit power law variation with shear rate at applied magnetic fields.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74962603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The formation and stabilization of water/AOT/dodecane microemulsion (water in oil) droplets by employing Small Angle Neutron Scattering (SANS) is demonstrated. The resulting structure exhibits strong inter-droplet attractive interaction that can be tuned by molar ratio (W) of water to AOT concentration. The strengthening of the inter-droplet attractive interaction with increase in W has been modeled using modified Ornstein-Zernicke relation. We further demonstrate that on addition of salt (NaCl), the inter-droplet attractive interaction is substantially weakened and hence the droplet stability is enhanced. The SANS data analysis confirms the monotonic decrease in both the correlation length and compressibility with increase in salt concentrations indicating the formation of microemulsion droplet system with increased stability and that the stability could be achieved for higher values of W with salt.The formation and stabilization of water/AOT/dodecane microemulsion (water in oil) droplets by employing Small Angle Neutron Scattering (SANS) is demonstrated. The resulting structure exhibits strong inter-droplet attractive interaction that can be tuned by molar ratio (W) of water to AOT concentration. The strengthening of the inter-droplet attractive interaction with increase in W has been modeled using modified Ornstein-Zernicke relation. We further demonstrate that on addition of salt (NaCl), the inter-droplet attractive interaction is substantially weakened and hence the droplet stability is enhanced. The SANS data analysis confirms the monotonic decrease in both the correlation length and compressibility with increase in salt concentrations indicating the formation of microemulsion droplet system with increased stability and that the stability could be achieved for higher values of W with salt.
{"title":"SANS investigation of structure and stability of water/AOT/dodecane microemulsion droplets","authors":"S. Abbas, D. Saha, V. Aswal","doi":"10.1063/1.5112873","DOIUrl":"https://doi.org/10.1063/1.5112873","url":null,"abstract":"The formation and stabilization of water/AOT/dodecane microemulsion (water in oil) droplets by employing Small Angle Neutron Scattering (SANS) is demonstrated. The resulting structure exhibits strong inter-droplet attractive interaction that can be tuned by molar ratio (W) of water to AOT concentration. The strengthening of the inter-droplet attractive interaction with increase in W has been modeled using modified Ornstein-Zernicke relation. We further demonstrate that on addition of salt (NaCl), the inter-droplet attractive interaction is substantially weakened and hence the droplet stability is enhanced. The SANS data analysis confirms the monotonic decrease in both the correlation length and compressibility with increase in salt concentrations indicating the formation of microemulsion droplet system with increased stability and that the stability could be achieved for higher values of W with salt.The formation and stabilization of water/AOT/dodecane microemulsion (water in oil) droplets by employing Small Angle Neutron Scattering (SANS) is demonstrated. The resulting structure exhibits strong inter-droplet attractive interaction that can be tuned by molar ratio (W) of water to AOT concentration. The strengthening of the inter-droplet attractive interaction with increase in W has been modeled using modified Ornstein-Zernicke relation. We further demonstrate that on addition of salt (NaCl), the inter-droplet attractive interaction is substantially weakened and hence the droplet stability is enhanced. The SANS data analysis confirms the monotonic decrease in both the correlation length and compressibility with increase in salt concentrations indicating the formation of microemulsion droplet system with increased stability and that the stability could be achieved for higher values of W with salt.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73700502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vivek Christhunathan, A. Augustine, Vishnu Sudarsanan, N. Vairamoorthy, P. Ravindran
This work demonstrates the battery-related properties of Li2Fe(SO4)2 and its Fe site Ti substituted derivatives (Li2Ti0.5Fe0.5(SO4)2 and Li2Ti(SO4)2) using ab-initio calculations. The calculated voltage profile of all these systems clearly indicates the increase of voltage with delithiation. Even though the average voltage values of Ti-substituted systems gradually changes with the Ti concentration, they are still in the range of requirement for a good cathode material. In most of the cases, Ti substitutions increase the specific capacity and energy density of Li2Fe(SO4)2. The negative enthalpy of formation implies that all the considered systems are thermodynamically stable. These results indicate that Ti-substituted Li2Fe(SO4)2 could be a potential cathode material for rechargeable Li-ion batteries.This work demonstrates the battery-related properties of Li2Fe(SO4)2 and its Fe site Ti substituted derivatives (Li2Ti0.5Fe0.5(SO4)2 and Li2Ti(SO4)2) using ab-initio calculations. The calculated voltage profile of all these systems clearly indicates the increase of voltage with delithiation. Even though the average voltage values of Ti-substituted systems gradually changes with the Ti concentration, they are still in the range of requirement for a good cathode material. In most of the cases, Ti substitutions increase the specific capacity and energy density of Li2Fe(SO4)2. The negative enthalpy of formation implies that all the considered systems are thermodynamically stable. These results indicate that Ti-substituted Li2Fe(SO4)2 could be a potential cathode material for rechargeable Li-ion batteries.
{"title":"Ab-initio modelling of new cathode material for Li-ion battery based on the Ti substituted Li2Fe(SO4)2","authors":"Vivek Christhunathan, A. Augustine, Vishnu Sudarsanan, N. Vairamoorthy, P. Ravindran","doi":"10.1063/1.5113447","DOIUrl":"https://doi.org/10.1063/1.5113447","url":null,"abstract":"This work demonstrates the battery-related properties of Li2Fe(SO4)2 and its Fe site Ti substituted derivatives (Li2Ti0.5Fe0.5(SO4)2 and Li2Ti(SO4)2) using ab-initio calculations. The calculated voltage profile of all these systems clearly indicates the increase of voltage with delithiation. Even though the average voltage values of Ti-substituted systems gradually changes with the Ti concentration, they are still in the range of requirement for a good cathode material. In most of the cases, Ti substitutions increase the specific capacity and energy density of Li2Fe(SO4)2. The negative enthalpy of formation implies that all the considered systems are thermodynamically stable. These results indicate that Ti-substituted Li2Fe(SO4)2 could be a potential cathode material for rechargeable Li-ion batteries.This work demonstrates the battery-related properties of Li2Fe(SO4)2 and its Fe site Ti substituted derivatives (Li2Ti0.5Fe0.5(SO4)2 and Li2Ti(SO4)2) using ab-initio calculations. The calculated voltage profile of all these systems clearly indicates the increase of voltage with delithiation. Even though the average voltage values of Ti-substituted systems gradually changes with the Ti concentration, they are still in the range of requirement for a good cathode material. In most of the cases, Ti substitutions increase the specific capacity and energy density of Li2Fe(SO4)2. The negative enthalpy of formation implies that all the considered systems are thermodynamically stable. These results indicate that Ti-substituted Li2Fe(SO4)2 could be a potential cathode material for rechargeable Li-ion batteries.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"153 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73717732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Roy, A. Mukhopadhyay, Shilabati Hembram, M. Ghosh, A. Majumdar
The application of conductive glass coating in recent years plays a significant role in research and commercial laboratories. We report the change in conducting property of Cu-Ti-Cl thin film coating onto glass substrate as a function of atmospheric pressure plasma (Ar+) treatment (upto 15 minutes). This metal-transition metal chloride coating is prepared by chemical solution process where polyvinyl alcohol (PVA) is used as a chelating agent. The UV-Vis absorption spectra reveal that the optical band gap of the thin film varies from 1.71eV to 2.51eV. A reduction in dc static resistance (2.1MΩ to 0.5MΩ) of the film is obtained from the voltage-current characteristics. The X-ray diffraction peak intensity also reduces with treatment time.The application of conductive glass coating in recent years plays a significant role in research and commercial laboratories. We report the change in conducting property of Cu-Ti-Cl thin film coating onto glass substrate as a function of atmospheric pressure plasma (Ar+) treatment (upto 15 minutes). This metal-transition metal chloride coating is prepared by chemical solution process where polyvinyl alcohol (PVA) is used as a chelating agent. The UV-Vis absorption spectra reveal that the optical band gap of the thin film varies from 1.71eV to 2.51eV. A reduction in dc static resistance (2.1MΩ to 0.5MΩ) of the film is obtained from the voltage-current characteristics. The X-ray diffraction peak intensity also reduces with treatment time.
{"title":"Conductive glass coating: Effect of atmospheric plasma treatment","authors":"A. Roy, A. Mukhopadhyay, Shilabati Hembram, M. Ghosh, A. Majumdar","doi":"10.1063/1.5113087","DOIUrl":"https://doi.org/10.1063/1.5113087","url":null,"abstract":"The application of conductive glass coating in recent years plays a significant role in research and commercial laboratories. We report the change in conducting property of Cu-Ti-Cl thin film coating onto glass substrate as a function of atmospheric pressure plasma (Ar+) treatment (upto 15 minutes). This metal-transition metal chloride coating is prepared by chemical solution process where polyvinyl alcohol (PVA) is used as a chelating agent. The UV-Vis absorption spectra reveal that the optical band gap of the thin film varies from 1.71eV to 2.51eV. A reduction in dc static resistance (2.1MΩ to 0.5MΩ) of the film is obtained from the voltage-current characteristics. The X-ray diffraction peak intensity also reduces with treatment time.The application of conductive glass coating in recent years plays a significant role in research and commercial laboratories. We report the change in conducting property of Cu-Ti-Cl thin film coating onto glass substrate as a function of atmospheric pressure plasma (Ar+) treatment (upto 15 minutes). This metal-transition metal chloride coating is prepared by chemical solution process where polyvinyl alcohol (PVA) is used as a chelating agent. The UV-Vis absorption spectra reveal that the optical band gap of the thin film varies from 1.71eV to 2.51eV. A reduction in dc static resistance (2.1MΩ to 0.5MΩ) of the film is obtained from the voltage-current characteristics. The X-ray diffraction peak intensity also reduces with treatment time.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76353416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To bring solar/electrical-to-hydrogen energy conversion processes into reality by fabricating non noble metal catalyst is an important agenda of researchers now a days through hydrogen evolution reaction (HER) by electrochemical method. Non noble metal catalyst such as CuMoO4 nanoparticles were successfully synthesized by hydrothermal process. Synthesized sample were characterized by XRD, Raman and FT-IR analysis. Morphology of the sample was observed by SEM and HR-TEM analysis. HER was performed by modification of synthesized CuMoO4 on Glassy Carbon Electrode.To bring solar/electrical-to-hydrogen energy conversion processes into reality by fabricating non noble metal catalyst is an important agenda of researchers now a days through hydrogen evolution reaction (HER) by electrochemical method. Non noble metal catalyst such as CuMoO4 nanoparticles were successfully synthesized by hydrothermal process. Synthesized sample were characterized by XRD, Raman and FT-IR analysis. Morphology of the sample was observed by SEM and HR-TEM analysis. HER was performed by modification of synthesized CuMoO4 on Glassy Carbon Electrode.
{"title":"Hydrogen evolution reaction with transition metal molybdate as cathode material","authors":"S. Muthamizh, V. Narayanan, R. Jayavel","doi":"10.1063/1.5113392","DOIUrl":"https://doi.org/10.1063/1.5113392","url":null,"abstract":"To bring solar/electrical-to-hydrogen energy conversion processes into reality by fabricating non noble metal catalyst is an important agenda of researchers now a days through hydrogen evolution reaction (HER) by electrochemical method. Non noble metal catalyst such as CuMoO4 nanoparticles were successfully synthesized by hydrothermal process. Synthesized sample were characterized by XRD, Raman and FT-IR analysis. Morphology of the sample was observed by SEM and HR-TEM analysis. HER was performed by modification of synthesized CuMoO4 on Glassy Carbon Electrode.To bring solar/electrical-to-hydrogen energy conversion processes into reality by fabricating non noble metal catalyst is an important agenda of researchers now a days through hydrogen evolution reaction (HER) by electrochemical method. Non noble metal catalyst such as CuMoO4 nanoparticles were successfully synthesized by hydrothermal process. Synthesized sample were characterized by XRD, Raman and FT-IR analysis. Morphology of the sample was observed by SEM and HR-TEM analysis. HER was performed by modification of synthesized CuMoO4 on Glassy Carbon Electrode.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83477850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The In/Se thin films were prepared by thermal evaporation method on glass substrate and were annealed at 200 °C for 1 hr. The indium diffusion into selenium matrix to form indium selenide phases like In2Se3, In4Se3 due to annealing was revealed from the X-ray diffraction study and also supported by the Raman spectra analysis. The optical band gap decreased with annealing as a result of different phase formation as studied from UV-visible spectroscopy. The formation of nano rod like structure in the as-prepared film and their disappearance upon annealing is probed by FESEM characterization.The In/Se thin films were prepared by thermal evaporation method on glass substrate and were annealed at 200 °C for 1 hr. The indium diffusion into selenium matrix to form indium selenide phases like In2Se3, In4Se3 due to annealing was revealed from the X-ray diffraction study and also supported by the Raman spectra analysis. The optical band gap decreased with annealing as a result of different phase formation as studied from UV-visible spectroscopy. The formation of nano rod like structure in the as-prepared film and their disappearance upon annealing is probed by FESEM characterization.
{"title":"Growth of indium selenide thin films by thermal annealing of In/Se bilayer","authors":"R. Panda, U. Singh, R. Naik, N. Mishra","doi":"10.1063/1.5113111","DOIUrl":"https://doi.org/10.1063/1.5113111","url":null,"abstract":"The In/Se thin films were prepared by thermal evaporation method on glass substrate and were annealed at 200 °C for 1 hr. The indium diffusion into selenium matrix to form indium selenide phases like In2Se3, In4Se3 due to annealing was revealed from the X-ray diffraction study and also supported by the Raman spectra analysis. The optical band gap decreased with annealing as a result of different phase formation as studied from UV-visible spectroscopy. The formation of nano rod like structure in the as-prepared film and their disappearance upon annealing is probed by FESEM characterization.The In/Se thin films were prepared by thermal evaporation method on glass substrate and were annealed at 200 °C for 1 hr. The indium diffusion into selenium matrix to form indium selenide phases like In2Se3, In4Se3 due to annealing was revealed from the X-ray diffraction study and also supported by the Raman spectra analysis. The optical band gap decreased with annealing as a result of different phase formation as studied from UV-visible spectroscopy. The formation of nano rod like structure in the as-prepared film and their disappearance upon annealing is probed by FESEM characterization.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83250181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lead-free sodium niobate (NaNbO3) ceramics is prepared via conventional solid state reaction technique at sintering temperature 1150 °C for 4 h. The structural and surface morphology of the sample has been done by using X-ray diffraction and Field emission scanning electron microscopy (FE-SEM), respectively. The XRD study of NaNbO3 (NN) sample confirmed the formation of single phase with orthorhombic crystal structure. The surface micrographs of NN sample indicates the formation of grains with clear grain boundaries and orthorhombic shape. The detailed investigation of dielectric properties of NN ceramics are done in wide frequency range (100 Hz – 1 MHz) at various temperatures (250 °C – 330 °C). The magnitude of real dielectric constant (e′) and dielectric loss (tan δ) are strongly dependent on temperature and frequency. The analysis of frequency dependent conductivity reveals that the conduction done by grain boundaries and grains, both. The impedance study reveals that the negative temperature coefficient of resistance (NTCR) behavior and time relaxation in NN ceramic.Lead-free sodium niobate (NaNbO3) ceramics is prepared via conventional solid state reaction technique at sintering temperature 1150 °C for 4 h. The structural and surface morphology of the sample has been done by using X-ray diffraction and Field emission scanning electron microscopy (FE-SEM), respectively. The XRD study of NaNbO3 (NN) sample confirmed the formation of single phase with orthorhombic crystal structure. The surface micrographs of NN sample indicates the formation of grains with clear grain boundaries and orthorhombic shape. The detailed investigation of dielectric properties of NN ceramics are done in wide frequency range (100 Hz – 1 MHz) at various temperatures (250 °C – 330 °C). The magnitude of real dielectric constant (e′) and dielectric loss (tan δ) are strongly dependent on temperature and frequency. The analysis of frequency dependent conductivity reveals that the conduction done by grain boundaries and grains, both. The impedance study reveals that the negative temperature coeffici...
{"title":"Effect of temperature and frequency on the studies of structural and dielectric behavior of ABO3 type orthorhombic perovskite","authors":"Abhinav Yadav, S. P. Mantry, P. M. Sarun","doi":"10.1063/1.5113434","DOIUrl":"https://doi.org/10.1063/1.5113434","url":null,"abstract":"Lead-free sodium niobate (NaNbO3) ceramics is prepared via conventional solid state reaction technique at sintering temperature 1150 °C for 4 h. The structural and surface morphology of the sample has been done by using X-ray diffraction and Field emission scanning electron microscopy (FE-SEM), respectively. The XRD study of NaNbO3 (NN) sample confirmed the formation of single phase with orthorhombic crystal structure. The surface micrographs of NN sample indicates the formation of grains with clear grain boundaries and orthorhombic shape. The detailed investigation of dielectric properties of NN ceramics are done in wide frequency range (100 Hz – 1 MHz) at various temperatures (250 °C – 330 °C). The magnitude of real dielectric constant (e′) and dielectric loss (tan δ) are strongly dependent on temperature and frequency. The analysis of frequency dependent conductivity reveals that the conduction done by grain boundaries and grains, both. The impedance study reveals that the negative temperature coefficient of resistance (NTCR) behavior and time relaxation in NN ceramic.Lead-free sodium niobate (NaNbO3) ceramics is prepared via conventional solid state reaction technique at sintering temperature 1150 °C for 4 h. The structural and surface morphology of the sample has been done by using X-ray diffraction and Field emission scanning electron microscopy (FE-SEM), respectively. The XRD study of NaNbO3 (NN) sample confirmed the formation of single phase with orthorhombic crystal structure. The surface micrographs of NN sample indicates the formation of grains with clear grain boundaries and orthorhombic shape. The detailed investigation of dielectric properties of NN ceramics are done in wide frequency range (100 Hz – 1 MHz) at various temperatures (250 °C – 330 °C). The magnitude of real dielectric constant (e′) and dielectric loss (tan δ) are strongly dependent on temperature and frequency. The analysis of frequency dependent conductivity reveals that the conduction done by grain boundaries and grains, both. The impedance study reveals that the negative temperature coeffici...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83300638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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