NiCo2O4 (NCO) nanostructures were synthesized by a simple hydrothermal method using three different surfactants such as ethylene glycol (EG), oxalic acid (OA) and ammonium fluoride (NHF). Morphology of the different nanostructured materials has been recorded using SEM. The electrochemical performance of the material has been demonstrated using three electrode system. NCO-EG urchin-like nanostructure exhibits the highest specific capacitance of 416 F g−1 at a current density of 0.5 A g−1 and it evolves 73.3 % of capacitance retention at 10 A g−1.NiCo2O4 (NCO) nanostructures were synthesized by a simple hydrothermal method using three different surfactants such as ethylene glycol (EG), oxalic acid (OA) and ammonium fluoride (NHF). Morphology of the different nanostructured materials has been recorded using SEM. The electrochemical performance of the material has been demonstrated using three electrode system. NCO-EG urchin-like nanostructure exhibits the highest specific capacitance of 416 F g−1 at a current density of 0.5 A g−1 and it evolves 73.3 % of capacitance retention at 10 A g−1.
采用乙二醇(EG)、草酸(OA)和氟化铵(NHF)三种不同的表面活性剂，采用简单的水热法制备了NiCo2O4 (NCO)纳米结构。利用扫描电镜记录了不同纳米结构材料的形貌。用三电极系统对材料的电化学性能进行了验证。NCO-EG类海胆纳米结构在0.5 a g−1电流密度下表现出最高的比电容416 F g−1，在10 a g−1电流密度下保持73.3%的电容。采用乙二醇(EG)、草酸(OA)和氟化铵(NHF)三种不同的表面活性剂，采用简单的水热法制备了NiCo2O4 (NCO)纳米结构。利用扫描电镜记录了不同纳米结构材料的形貌。用三电极系统对材料的电化学性能进行了验证。NCO-EG类海胆纳米结构在0.5 a g−1电流密度下表现出最高的比电容416 F g−1，在10 a g−1电流密度下保持73.3%的电容。
{"title":"Pseudocapacitive performance of NiCo2O4 nanostructures","authors":"A. J. C. Mary, A. C. Bose","doi":"10.1063/1.5113391","DOIUrl":"https://doi.org/10.1063/1.5113391","url":null,"abstract":"NiCo2O4 (NCO) nanostructures were synthesized by a simple hydrothermal method using three different surfactants such as ethylene glycol (EG), oxalic acid (OA) and ammonium fluoride (NHF). Morphology of the different nanostructured materials has been recorded using SEM. The electrochemical performance of the material has been demonstrated using three electrode system. NCO-EG urchin-like nanostructure exhibits the highest specific capacitance of 416 F g−1 at a current density of 0.5 A g−1 and it evolves 73.3 % of capacitance retention at 10 A g−1.NiCo2O4 (NCO) nanostructures were synthesized by a simple hydrothermal method using three different surfactants such as ethylene glycol (EG), oxalic acid (OA) and ammonium fluoride (NHF). Morphology of the different nanostructured materials has been recorded using SEM. The electrochemical performance of the material has been demonstrated using three electrode system. NCO-EG urchin-like nanostructure exhibits the highest specific capacitance of 416 F g−1 at a current density of 0.5 A g−1 and it evolves 73.3 % of capacitance retention at 10 A g−1.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84078403","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}
G. Sridevi, S. Bhagade, V. Jayalakshmi, Sandhya Cole
Cadmium sulfide zinc phosphate (CdS-Zn3(PO4)2) nanocomposite is synthesized by effective hydrothermal method. Hydrothermal technique produces highly homogeneous crystalline product and controls particle morphology at low reaction temperatures. The prepared powder samples are characterized by Powder X-ray diffraction (XRD), Diffusion reflectance spectrophotometer (DRS), Scanning electron microscope (SEM). From XRD technique the average crystal size of prepared CdS-Zn3(Po4)2 nanocomposite is in the range of 12 nm. Strain and dislocation density are calculated from XRD studies. Surface morphology of the samples are analyzed by SEM. Bandgap energies are calculated from Kubelka-Munk model by Diffusion electron spectrophotometer.
{"title":"Synthesis and characterization of CdS-Zn3(PO4)2 nanocomposite via hydrothermal method","authors":"G. Sridevi, S. Bhagade, V. Jayalakshmi, Sandhya Cole","doi":"10.1063/1.5112994","DOIUrl":"https://doi.org/10.1063/1.5112994","url":null,"abstract":"Cadmium sulfide zinc phosphate (CdS-Zn3(PO4)2) nanocomposite is synthesized by effective hydrothermal method. Hydrothermal technique produces highly homogeneous crystalline product and controls particle morphology at low reaction temperatures. The prepared powder samples are characterized by Powder X-ray diffraction (XRD), Diffusion reflectance spectrophotometer (DRS), Scanning electron microscope (SEM). From XRD technique the average crystal size of prepared CdS-Zn3(Po4)2 nanocomposite is in the range of 12 nm. Strain and dislocation density are calculated from XRD studies. Surface morphology of the samples are analyzed by SEM. Bandgap energies are calculated from Kubelka-Munk model by Diffusion electron spectrophotometer.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84403615","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 thin films of the phase change material Ge2Sb2Te5 (GST), pure and Ag-doped, were studied. These films were prepared by thermal evaporation method. Amorphous nature of both pure and Ag-doped GST thin films has been confirmed from X-ray diffraction analysis. Raman spectra confirms the host structure of GST which is confirmed by the two sharp peaks at 126.4 cm−1 and 144.9 cm−1 for GST thin films. The hole concentration was found to increase by three orders of magnitude due to Ag doping, as measured by Hall measurements. I-V measurements of the samples show thermal switching at moderate voltage as large current flows through Ag-doped GST. The increase in conductivity was attributed to the crystallization of the films due to heating caused by the large electric current for I-V measurements.In this work thin films of the phase change material Ge2Sb2Te5 (GST), pure and Ag-doped, were studied. These films were prepared by thermal evaporation method. Amorphous nature of both pure and Ag-doped GST thin films has been confirmed from X-ray diffraction analysis. Raman spectra confirms the host structure of GST which is confirmed by the two sharp peaks at 126.4 cm−1 and 144.9 cm−1 for GST thin films. The hole concentration was found to increase by three orders of magnitude due to Ag doping, as measured by Hall measurements. I-V measurements of the samples show thermal switching at moderate voltage as large current flows through Ag-doped GST. The increase in conductivity was attributed to the crystallization of the films due to heating caused by the large electric current for I-V measurements.
{"title":"Effect of Ag doping on electrical properties Ge2Sb2Te5 thin films","authors":"N. Kanda, A. Thakur, Abhinav Pratap Singh","doi":"10.1063/1.5113099","DOIUrl":"https://doi.org/10.1063/1.5113099","url":null,"abstract":"In this work thin films of the phase change material Ge2Sb2Te5 (GST), pure and Ag-doped, were studied. These films were prepared by thermal evaporation method. Amorphous nature of both pure and Ag-doped GST thin films has been confirmed from X-ray diffraction analysis. Raman spectra confirms the host structure of GST which is confirmed by the two sharp peaks at 126.4 cm−1 and 144.9 cm−1 for GST thin films. The hole concentration was found to increase by three orders of magnitude due to Ag doping, as measured by Hall measurements. I-V measurements of the samples show thermal switching at moderate voltage as large current flows through Ag-doped GST. The increase in conductivity was attributed to the crystallization of the films due to heating caused by the large electric current for I-V measurements.In this work thin films of the phase change material Ge2Sb2Te5 (GST), pure and Ag-doped, were studied. These films were prepared by thermal evaporation method. Amorphous nature of both pure and Ag-doped GST thin films has been confirmed from X-ray diffraction analysis. Raman spectra confirms the host structure of GST which is confirmed by the two sharp peaks at 126.4 cm−1 and 144.9 cm−1 for GST thin films. The hole concentration was found to increase by three orders of magnitude due to Ag doping, as measured by Hall measurements. I-V measurements of the samples show thermal switching at moderate voltage as large current flows through Ag-doped GST. The increase in conductivity was attributed to the crystallization of the films due to heating caused by the large electric current for I-V measurements.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"285 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84708256","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. Yadav, Aditi Upadhyaya, S. Gupta, A. Verma, C. Negi
The polymer-carbon nanocomposites have achieved a remarkable progress over the past years. Their unique electrical and optical properties have attracted the attention for photovoltaic and optoelectronic devices. Therefore, in this paper we report fabrication of P3HT:graphene nanocomposite based photodiode with the architecture PET/ITO/P3HT:graphene/Al on Indium tin oxide (ITO) coated flexible polyethylene terephthalate (PET) substrate. The measured current-voltage (I-V) characteristics of the fabricated device under dark condition were found to be similar to the Schottky diode. Various crucial diode parameters, such as ideality factor, barrier height, series resistance etc., have been estimated in the backdrop of Shockley model. The double logarithmic J-V characteristic analysis was carried out to determine the charge transport properties. Moreover, the device offers a good photoconductive behavior, which shows potential of graphene/polymer composite for development of flexible photovoltaic and optoelectronic devices.The polymer-carbon nanocomposites have achieved a remarkable progress over the past years. Their unique electrical and optical properties have attracted the attention for photovoltaic and optoelectronic devices. Therefore, in this paper we report fabrication of P3HT:graphene nanocomposite based photodiode with the architecture PET/ITO/P3HT:graphene/Al on Indium tin oxide (ITO) coated flexible polyethylene terephthalate (PET) substrate. The measured current-voltage (I-V) characteristics of the fabricated device under dark condition were found to be similar to the Schottky diode. Various crucial diode parameters, such as ideality factor, barrier height, series resistance etc., have been estimated in the backdrop of Shockley model. The double logarithmic J-V characteristic analysis was carried out to determine the charge transport properties. Moreover, the device offers a good photoconductive behavior, which shows potential of graphene/polymer composite for development of flexible photovoltaic and optoelectr...
{"title":"Solution processed flexible photodiode based on poly(3-hexylthiophene):graphene composite","authors":"A. Yadav, Aditi Upadhyaya, S. Gupta, A. Verma, C. Negi","doi":"10.1063/1.5113057","DOIUrl":"https://doi.org/10.1063/1.5113057","url":null,"abstract":"The polymer-carbon nanocomposites have achieved a remarkable progress over the past years. Their unique electrical and optical properties have attracted the attention for photovoltaic and optoelectronic devices. Therefore, in this paper we report fabrication of P3HT:graphene nanocomposite based photodiode with the architecture PET/ITO/P3HT:graphene/Al on Indium tin oxide (ITO) coated flexible polyethylene terephthalate (PET) substrate. The measured current-voltage (I-V) characteristics of the fabricated device under dark condition were found to be similar to the Schottky diode. Various crucial diode parameters, such as ideality factor, barrier height, series resistance etc., have been estimated in the backdrop of Shockley model. The double logarithmic J-V characteristic analysis was carried out to determine the charge transport properties. Moreover, the device offers a good photoconductive behavior, which shows potential of graphene/polymer composite for development of flexible photovoltaic and optoelectronic devices.The polymer-carbon nanocomposites have achieved a remarkable progress over the past years. Their unique electrical and optical properties have attracted the attention for photovoltaic and optoelectronic devices. Therefore, in this paper we report fabrication of P3HT:graphene nanocomposite based photodiode with the architecture PET/ITO/P3HT:graphene/Al on Indium tin oxide (ITO) coated flexible polyethylene terephthalate (PET) substrate. The measured current-voltage (I-V) characteristics of the fabricated device under dark condition were found to be similar to the Schottky diode. Various crucial diode parameters, such as ideality factor, barrier height, series resistance etc., have been estimated in the backdrop of Shockley model. The double logarithmic J-V characteristic analysis was carried out to determine the charge transport properties. Moreover, the device offers a good photoconductive behavior, which shows potential of graphene/polymer composite for development of flexible photovoltaic and optoelectr...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"353 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84876226","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}
Sandeep B. Somvanshi, R. V. Kumar, J. S. Kounsalye, T. Saraf, K. M. Jadhav
In the present work, investigations of structural, magnetic and induction heating properties of surface functionalized zinc ferrite nanoparticles were carried out successfully. The zinc ferrite nanoparticles were prepared by co-precipitation route and further functionalized with oleic acid. The room temperature X-ray diffraction pattern confirmed the typical cubic spinel structure of the prepared nanoparticles. The average crystallite size calculated from Scherrer’s formula was found to be 12.30 nm confirming the nanocrystalline nature of zinc ferrite nanoparticles. The characteristic peaks observed in FT-IR spectrum confirmed the formation of cubic spinel structure and oleic acid coating over zinc ferrite nanoparticles. The room temperature magnetization behaviour revealed the superparamagnetic nature of the prepared nanoparticles. The induction heating behaviour shows a desirable amount (6 mg/mL) of zinc ferrite nanoparticles can able to achieve 42°C temperature for 600 s at 4.0 kA/m. This indicates that the resulting zinc ferrite nanoparticles are promising materials in magnetic hyperthermia treatments.
{"title":"Investigations of structural, magnetic and induction heating properties of surface functionalized zinc ferrite nanoparticles for hyperthermia applications","authors":"Sandeep B. Somvanshi, R. V. Kumar, J. S. Kounsalye, T. Saraf, K. M. Jadhav","doi":"10.1063/1.5113361","DOIUrl":"https://doi.org/10.1063/1.5113361","url":null,"abstract":"In the present work, investigations of structural, magnetic and induction heating properties of surface functionalized zinc ferrite nanoparticles were carried out successfully. The zinc ferrite nanoparticles were prepared by co-precipitation route and further functionalized with oleic acid. The room temperature X-ray diffraction pattern confirmed the typical cubic spinel structure of the prepared nanoparticles. The average crystallite size calculated from Scherrer’s formula was found to be 12.30 nm confirming the nanocrystalline nature of zinc ferrite nanoparticles. The characteristic peaks observed in FT-IR spectrum confirmed the formation of cubic spinel structure and oleic acid coating over zinc ferrite nanoparticles. The room temperature magnetization behaviour revealed the superparamagnetic nature of the prepared nanoparticles. The induction heating behaviour shows a desirable amount (6 mg/mL) of zinc ferrite nanoparticles can able to achieve 42°C temperature for 600 s at 4.0 kA/m. This indicates that the resulting zinc ferrite nanoparticles are promising materials in magnetic hyperthermia treatments.","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":"90987843","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 present paper describes the synthesis and in vitro bioactivity of SiO2-CaO-Na2O bio-glass using bio-waste. Rice husk ash (RHA) and eggshells bio-waste have been used as resources for extracting the silicon dioxide and calcium oxide respectively. Glass samples were obtained by standard melt-quenching technique. The bioactivity was assessed using in vitro studies in simulated body fluid (SBF). The nucleation and growth of hydroxyapatite were confirmed using XRD, FTIR and SEM-EDS characterizations. XRD have confirmed the phase of hydroxyapatite, well matched with its standard JCPDS data. FTIR spectra reveal the apparent silicate stretching, bending vibration modes and phosphate absorption bands. Surface morphology has been observed using SEM images resulting globular shape of hydroxyapatite formed. And, the chemical constituents of apatite such as Ca and P have been confirmed by EDS spectra. These results perfectly established that, RHA and eggshells are potentially beneficial sources for producing bio-glasses.The present paper describes the synthesis and in vitro bioactivity of SiO2-CaO-Na2O bio-glass using bio-waste. Rice husk ash (RHA) and eggshells bio-waste have been used as resources for extracting the silicon dioxide and calcium oxide respectively. Glass samples were obtained by standard melt-quenching technique. The bioactivity was assessed using in vitro studies in simulated body fluid (SBF). The nucleation and growth of hydroxyapatite were confirmed using XRD, FTIR and SEM-EDS characterizations. XRD have confirmed the phase of hydroxyapatite, well matched with its standard JCPDS data. FTIR spectra reveal the apparent silicate stretching, bending vibration modes and phosphate absorption bands. Surface morphology has been observed using SEM images resulting globular shape of hydroxyapatite formed. And, the chemical constituents of apatite such as Ca and P have been confirmed by EDS spectra. These results perfectly established that, RHA and eggshells are potentially beneficial sources for producing bio-g...
本文介绍了利用生物废弃物制备二氧化硅- cao - na2o生物玻璃及其体外生物活性。稻壳灰和蛋壳生物废弃物分别作为提取二氧化硅和氧化钙的资源。玻璃样品采用标准熔融淬火技术制备。通过体外模拟体液(SBF)研究评估其生物活性。采用XRD、FTIR和SEM-EDS表征羟基磷灰石的成核和生长。XRD证实了羟基磷灰石的物相，与JCPDS标准数据吻合良好。FTIR光谱显示了明显的硅酸盐拉伸、弯曲振动模式和磷酸盐吸收带。表面形貌已观察到使用扫描电镜图像产生球形的羟基磷灰石形成。通过能谱分析，确定了磷灰石中的钙、磷等化学成分。这些结果完美地证明了RHA和蛋壳是生产生物玻璃的潜在有益来源。本文介绍了利用生物废弃物制备二氧化硅- cao - na2o生物玻璃及其体外生物活性。稻壳灰和蛋壳生物废弃物分别作为提取二氧化硅和氧化钙的资源。玻璃样品采用标准熔融淬火技术制备。通过体外模拟体液(SBF)研究评估其生物活性。采用XRD、FTIR和SEM-EDS表征羟基磷灰石的成核和生长。XRD证实了羟基磷灰石的物相，与JCPDS标准数据吻合良好。FTIR光谱显示了明显的硅酸盐拉伸、弯曲振动模式和磷酸盐吸收带。表面形貌已观察到使用扫描电镜图像产生球形的羟基磷灰石形成。通过能谱分析，确定了磷灰石中的钙、磷等化学成分。这些结果完美地证明了RHA和蛋壳是潜在的有益的生产生物蛋白的来源。
{"title":"Synthesis and in vitro bioactivity of SiO2-CaO-Na2O glass using bio-waste resources","authors":"P. Srinath, P. A. Azeem, K. V. Reddy, S. R. Kumar","doi":"10.1063/1.5113072","DOIUrl":"https://doi.org/10.1063/1.5113072","url":null,"abstract":"The present paper describes the synthesis and in vitro bioactivity of SiO2-CaO-Na2O bio-glass using bio-waste. Rice husk ash (RHA) and eggshells bio-waste have been used as resources for extracting the silicon dioxide and calcium oxide respectively. Glass samples were obtained by standard melt-quenching technique. The bioactivity was assessed using in vitro studies in simulated body fluid (SBF). The nucleation and growth of hydroxyapatite were confirmed using XRD, FTIR and SEM-EDS characterizations. XRD have confirmed the phase of hydroxyapatite, well matched with its standard JCPDS data. FTIR spectra reveal the apparent silicate stretching, bending vibration modes and phosphate absorption bands. Surface morphology has been observed using SEM images resulting globular shape of hydroxyapatite formed. And, the chemical constituents of apatite such as Ca and P have been confirmed by EDS spectra. These results perfectly established that, RHA and eggshells are potentially beneficial sources for producing bio-glasses.The present paper describes the synthesis and in vitro bioactivity of SiO2-CaO-Na2O bio-glass using bio-waste. Rice husk ash (RHA) and eggshells bio-waste have been used as resources for extracting the silicon dioxide and calcium oxide respectively. Glass samples were obtained by standard melt-quenching technique. The bioactivity was assessed using in vitro studies in simulated body fluid (SBF). The nucleation and growth of hydroxyapatite were confirmed using XRD, FTIR and SEM-EDS characterizations. XRD have confirmed the phase of hydroxyapatite, well matched with its standard JCPDS data. FTIR spectra reveal the apparent silicate stretching, bending vibration modes and phosphate absorption bands. Surface morphology has been observed using SEM images resulting globular shape of hydroxyapatite formed. And, the chemical constituents of apatite such as Ca and P have been confirmed by EDS spectra. These results perfectly established that, RHA and eggshells are potentially beneficial sources for producing bio-g...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82049897","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}
Wide-angle X-ray scattering (WAXS) for the considered raw MCU-5 cotton fiber has been carried out using imaging plate system (Dip-3200) with dimension 440 x 240 mm2. By employing Linked atom least square (LALS) method, we are reporting here the molecular and crystal structure of this cotton fiber. We have computed elastic moduli tensor components of this fiber. From the bond angle, dihedral angles we have computed Young’s modulus as 76 GPA, which is in agreement with the earlier reported values.Wide-angle X-ray scattering (WAXS) for the considered raw MCU-5 cotton fiber has been carried out using imaging plate system (Dip-3200) with dimension 440 x 240 mm2. By employing Linked atom least square (LALS) method, we are reporting here the molecular and crystal structure of this cotton fiber. We have computed elastic moduli tensor components of this fiber. From the bond angle, dihedral angles we have computed Young’s modulus as 76 GPA, which is in agreement with the earlier reported values.
利用尺寸为440 x 240 mm2的成像板系统(Dip-3200)对所考虑的MCU-5棉纤维进行了广角x射线散射(WAXS)。本文采用链接原子最小二乘(LALS)方法，报道了这种棉纤维的分子和晶体结构。我们计算了这种纤维的弹性模量张量分量。从键角、二面角计算得到杨氏模量为76 GPA，与之前报道的值一致。利用尺寸为440 x 240 mm2的成像板系统(Dip-3200)对所考虑的MCU-5棉纤维进行了广角x射线散射(WAXS)。本文采用链接原子最小二乘(LALS)方法，报道了这种棉纤维的分子和晶体结构。我们计算了这种纤维的弹性模量张量分量。从键角、二面角计算得到杨氏模量为76 GPA，与之前报道的值一致。
{"title":"Determination of crystal structure and elastic constants of MCU-5 cotton fiber using WAXS data","authors":"V. Manju, S. Divakara, K. Byrappa, R. Somashekar","doi":"10.1063/1.5112871","DOIUrl":"https://doi.org/10.1063/1.5112871","url":null,"abstract":"Wide-angle X-ray scattering (WAXS) for the considered raw MCU-5 cotton fiber has been carried out using imaging plate system (Dip-3200) with dimension 440 x 240 mm2. By employing Linked atom least square (LALS) method, we are reporting here the molecular and crystal structure of this cotton fiber. We have computed elastic moduli tensor components of this fiber. From the bond angle, dihedral angles we have computed Young’s modulus as 76 GPA, which is in agreement with the earlier reported values.Wide-angle X-ray scattering (WAXS) for the considered raw MCU-5 cotton fiber has been carried out using imaging plate system (Dip-3200) with dimension 440 x 240 mm2. By employing Linked atom least square (LALS) method, we are reporting here the molecular and crystal structure of this cotton fiber. We have computed elastic moduli tensor components of this fiber. From the bond angle, dihedral angles we have computed Young’s modulus as 76 GPA, which is in agreement with the earlier reported values.","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":"80736388","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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