Developing a high specific-capacitance, quick charging and long cycle supercapacitor electrodes are essential for the future energy storage devices. In this paper, we report defect induced reduced graphene oxide (dRGO)-MnOx composites, which were prepared through redox reaction of KMnO4 and graphene oxide. The deformation/increasing defects in graphene sheets confirmed through micro-Raman studies. The dRGO-MnOx composite exhibit a high specific-capacitance, 264 Fg−1 at 0.2 Ag−1 in 1 M Na2SO4 neutral electrolyte. Most importantly, the dRGO-MnOx electrode was able to inhibit the outstanding cyclic performance of 153% capacitance retention and 100% Coulombic efficiency after 10,000 cycles at a high current density of 10 Ag−1. It also had 85% capacitance at a very short time (1/10 charging time of 0.2 Ag−1) with a charging current density at 1 Ag−1 and discharge current density of 0.2 Ag−1. The as-prepared dRGO-MnOx composites will find potential use in electrochemical energy storage applications.Developing a high specific-capacitance, quick charging and long cycle supercapacitor electrodes are essential for the future energy storage devices. In this paper, we report defect induced reduced graphene oxide (dRGO)-MnOx composites, which were prepared through redox reaction of KMnO4 and graphene oxide. The deformation/increasing defects in graphene sheets confirmed through micro-Raman studies. The dRGO-MnOx composite exhibit a high specific-capacitance, 264 Fg−1 at 0.2 Ag−1 in 1 M Na2SO4 neutral electrolyte. Most importantly, the dRGO-MnOx electrode was able to inhibit the outstanding cyclic performance of 153% capacitance retention and 100% Coulombic efficiency after 10,000 cycles at a high current density of 10 Ag−1. It also had 85% capacitance at a very short time (1/10 charging time of 0.2 Ag−1) with a charging current density at 1 Ag−1 and discharge current density of 0.2 Ag−1. The as-prepared dRGO-MnOx composites will find potential use in electrochemical energy storage applications.
开发高比电容、快速充电和长周期的超级电容器电极是未来储能装置的必要条件。本文报道了通过KMnO4和氧化石墨烯氧化还原反应制备缺陷诱导还原氧化石墨烯(dRGO)-MnOx复合材料。通过微拉曼研究证实了石墨烯片的变形/增加缺陷。dRGO-MnOx复合材料在1 M Na2SO4中性电解质中，在0.2 Ag−1时具有264 Fg−1的高比电容。最重要的是，在10 Ag−1的高电流密度下，dRGO-MnOx电极能够在10,000次循环后保持153%的电容保持率和100%的库仑效率。在极短的时间内(1/10充电时间为0.2 Ag−1)具有85%的电容，充电电流密度为1 Ag−1，放电电流密度为0.2 Ag−1。制备的dRGO-MnOx复合材料将在电化学储能应用中找到潜在的用途。开发高比电容、快速充电和长周期的超级电容器电极是未来储能装置的必要条件。本文报道了通过KMnO4和氧化石墨烯氧化还原反应制备缺陷诱导还原氧化石墨烯(dRGO)-MnOx复合材料。通过微拉曼研究证实了石墨烯片的变形/增加缺陷。dRGO-MnOx复合材料在1 M Na2SO4中性电解质中，在0.2 Ag−1时具有264 Fg−1的高比电容。最重要的是，在10 Ag−1的高电流密度下，dRGO-MnOx电极能够在10,000次循环后保持153%的电容保持率和100%的库仑效率。在极短的时间内(1/10充电时间为0.2 Ag−1)具有85%的电容，充电电流密度为1 Ag−1，放电电流密度为0.2 Ag−1。制备的dRGO-MnOx复合材料将在电化学储能应用中找到潜在的用途。
{"title":"Defect induced RGO-MnOx hybrid electrodes for supercapacitor applications","authors":"D. Prakash, S. Manivannan","doi":"10.1063/1.5113420","DOIUrl":"https://doi.org/10.1063/1.5113420","url":null,"abstract":"Developing a high specific-capacitance, quick charging and long cycle supercapacitor electrodes are essential for the future energy storage devices. In this paper, we report defect induced reduced graphene oxide (dRGO)-MnOx composites, which were prepared through redox reaction of KMnO4 and graphene oxide. The deformation/increasing defects in graphene sheets confirmed through micro-Raman studies. The dRGO-MnOx composite exhibit a high specific-capacitance, 264 Fg−1 at 0.2 Ag−1 in 1 M Na2SO4 neutral electrolyte. Most importantly, the dRGO-MnOx electrode was able to inhibit the outstanding cyclic performance of 153% capacitance retention and 100% Coulombic efficiency after 10,000 cycles at a high current density of 10 Ag−1. It also had 85% capacitance at a very short time (1/10 charging time of 0.2 Ag−1) with a charging current density at 1 Ag−1 and discharge current density of 0.2 Ag−1. The as-prepared dRGO-MnOx composites will find potential use in electrochemical energy storage applications.Developing a high specific-capacitance, quick charging and long cycle supercapacitor electrodes are essential for the future energy storage devices. In this paper, we report defect induced reduced graphene oxide (dRGO)-MnOx composites, which were prepared through redox reaction of KMnO4 and graphene oxide. The deformation/increasing defects in graphene sheets confirmed through micro-Raman studies. The dRGO-MnOx composite exhibit a high specific-capacitance, 264 Fg−1 at 0.2 Ag−1 in 1 M Na2SO4 neutral electrolyte. Most importantly, the dRGO-MnOx electrode was able to inhibit the outstanding cyclic performance of 153% capacitance retention and 100% Coulombic efficiency after 10,000 cycles at a high current density of 10 Ag−1. It also had 85% capacitance at a very short time (1/10 charging time of 0.2 Ag−1) with a charging current density at 1 Ag−1 and discharge current density of 0.2 Ag−1. The as-prepared dRGO-MnOx composites will find potential use in electrochemical energy storage applications.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87169815","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}
S. Gandhi, D. Mukherjee, A. Rav, K. Joshi, T. C. Kaushik
Plate impact experiments have been carried out on 6061 grade aluminium alloy to determine the Hugoniot data points and mechanical failure properties like spall strength and dynamic yield strength at high strain rates. In each experiment, the shock pressure in the target material has been measured using piezo-resistive manganin gauge. In four plate impact experiments, performed at impact velocities of 196 m/s, 288m/s, 490m/s and 649m/s, peak shock pressures of 1.4GPa, 2.2GPa, 3.8GPa and 5.2GPa, respectively, have been generated in the target. To determine the spall strength and dynamic yield strength the velocity history of the free surface of target plate has been obtained employing the velocity interferometer system for any reflector (VISAR). The spall strength derived from the free surface velocity histories corresponding to impact velocities 196m/s, 288m/s and 490m/s are 0.81GPa, 0.96GPa and 1.08 GPa, respectively, with average strain rates ranging between 1.8×10 4/s to 3.7×104/s. The dynamic yield strength calculated from the experimentally derived Hugoniot Elastic Limit (HEL) is found to vary in the range 0.096GPa to 0.12GPa. The value of the spall strength determined in the present work is significantly higher than the quasi static ultimate tensile strength of ∼0.21GPa, whereas the dynamic yield strength remains more or less close to the quasi static value of 0.11GPa. These results indicate that 6061 aluminium alloy displays higher mechanical strength under dynamic loading condition as compared to that under static loading. These high strain rate mechanical properties of 6061 aluminium alloy are also compared with those of 2024 aluminium alloy.Plate impact experiments have been carried out on 6061 grade aluminium alloy to determine the Hugoniot data points and mechanical failure properties like spall strength and dynamic yield strength at high strain rates. In each experiment, the shock pressure in the target material has been measured using piezo-resistive manganin gauge. In four plate impact experiments, performed at impact velocities of 196 m/s, 288m/s, 490m/s and 649m/s, peak shock pressures of 1.4GPa, 2.2GPa, 3.8GPa and 5.2GPa, respectively, have been generated in the target. To determine the spall strength and dynamic yield strength the velocity history of the free surface of target plate has been obtained employing the velocity interferometer system for any reflector (VISAR). The spall strength derived from the free surface velocity histories corresponding to impact velocities 196m/s, 288m/s and 490m/s are 0.81GPa, 0.96GPa and 1.08 GPa, respectively, with average strain rates ranging between 1.8×10 4/s to 3.7×104/s. The dynamic yield str...
{"title":"Determination of Hugoniot and strength properties of 6061 aluminium alloy under dynamic loading","authors":"S. Gandhi, D. Mukherjee, A. Rav, K. Joshi, T. C. Kaushik","doi":"10.1063/1.5113047","DOIUrl":"https://doi.org/10.1063/1.5113047","url":null,"abstract":"Plate impact experiments have been carried out on 6061 grade aluminium alloy to determine the Hugoniot data points and mechanical failure properties like spall strength and dynamic yield strength at high strain rates. In each experiment, the shock pressure in the target material has been measured using piezo-resistive manganin gauge. In four plate impact experiments, performed at impact velocities of 196 m/s, 288m/s, 490m/s and 649m/s, peak shock pressures of 1.4GPa, 2.2GPa, 3.8GPa and 5.2GPa, respectively, have been generated in the target. To determine the spall strength and dynamic yield strength the velocity history of the free surface of target plate has been obtained employing the velocity interferometer system for any reflector (VISAR). The spall strength derived from the free surface velocity histories corresponding to impact velocities 196m/s, 288m/s and 490m/s are 0.81GPa, 0.96GPa and 1.08 GPa, respectively, with average strain rates ranging between 1.8×10 4/s to 3.7×104/s. The dynamic yield strength calculated from the experimentally derived Hugoniot Elastic Limit (HEL) is found to vary in the range 0.096GPa to 0.12GPa. The value of the spall strength determined in the present work is significantly higher than the quasi static ultimate tensile strength of ∼0.21GPa, whereas the dynamic yield strength remains more or less close to the quasi static value of 0.11GPa. These results indicate that 6061 aluminium alloy displays higher mechanical strength under dynamic loading condition as compared to that under static loading. These high strain rate mechanical properties of 6061 aluminium alloy are also compared with those of 2024 aluminium alloy.Plate impact experiments have been carried out on 6061 grade aluminium alloy to determine the Hugoniot data points and mechanical failure properties like spall strength and dynamic yield strength at high strain rates. In each experiment, the shock pressure in the target material has been measured using piezo-resistive manganin gauge. In four plate impact experiments, performed at impact velocities of 196 m/s, 288m/s, 490m/s and 649m/s, peak shock pressures of 1.4GPa, 2.2GPa, 3.8GPa and 5.2GPa, respectively, have been generated in the target. To determine the spall strength and dynamic yield strength the velocity history of the free surface of target plate has been obtained employing the velocity interferometer system for any reflector (VISAR). The spall strength derived from the free surface velocity histories corresponding to impact velocities 196m/s, 288m/s and 490m/s are 0.81GPa, 0.96GPa and 1.08 GPa, respectively, with average strain rates ranging between 1.8×10 4/s to 3.7×104/s. The dynamic yield str...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83998339","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}
We investigated the phase diagram of cubic Cu2OSeO3 using temperature dependent magnetic susceptibility and Arrot plot analysis. Different five phases have been observed in Cu2OSeO3 viz: single dom...
{"title":"Multiple phases in skyrmion host Cu2OSeO3","authors":"H. Chauhan, S. Ghosh","doi":"10.1063/1.5113356","DOIUrl":"https://doi.org/10.1063/1.5113356","url":null,"abstract":"We investigated the phase diagram of cubic Cu2OSeO3 using temperature dependent magnetic susceptibility and Arrot plot analysis. Different five phases have been observed in Cu2OSeO3 viz: single dom...","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":"88999252","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 insufficient utilization of incident solar radiation in UV and IR region by existing single-junction photovoltaic devices restrict their efficiency. The triple molybdate NaCaLa(MoO4)3:Tb3+/Yb3+ phosphor was synthesized by solid state method in order to harness the unutilized part of solar spectrum. The structural and optical studies such as X-Ray diffraction (XRD), Photoluminescence (PL), Up-conversion (UC) and UV-Vis diffuse reflectance characterizations were carried out to examine the prepared sample. The structural refinement of XRD powder data of prepared phosphor was also performed with space group I41a(88). The sample was characterized by dual excitation i.e. UV and IR radiation that shows green emission corresponds to 5D4-7F5 transition of Tb3+ ions. The obtained results indicate that synthesized material can be used as spectral converter to convert unutilized incident solar photons into the energies that are more effectively absorbed by the solar cell, hence efficiency can be improved.The insufficient utilization of incident solar radiation in UV and IR region by existing single-junction photovoltaic devices restrict their efficiency. The triple molybdate NaCaLa(MoO4)3:Tb3+/Yb3+ phosphor was synthesized by solid state method in order to harness the unutilized part of solar spectrum. The structural and optical studies such as X-Ray diffraction (XRD), Photoluminescence (PL), Up-conversion (UC) and UV-Vis diffuse reflectance characterizations were carried out to examine the prepared sample. The structural refinement of XRD powder data of prepared phosphor was also performed with space group I41a(88). The sample was characterized by dual excitation i.e. UV and IR radiation that shows green emission corresponds to 5D4-7F5 transition of Tb3+ ions. The obtained results indicate that synthesized material can be used as spectral converter to convert unutilized incident solar photons into the energies that are more effectively absorbed by the solar cell, hence efficiency can be improved.
{"title":"Downshifting and up-conversion luminescent properties of triple molybdate NaCaLa(MoO4)3:Tb3+/Yb3+ phosphor for solar cell application","authors":"A. Verma, S. Sharma","doi":"10.1063/1.5113401","DOIUrl":"https://doi.org/10.1063/1.5113401","url":null,"abstract":"The insufficient utilization of incident solar radiation in UV and IR region by existing single-junction photovoltaic devices restrict their efficiency. The triple molybdate NaCaLa(MoO4)3:Tb3+/Yb3+ phosphor was synthesized by solid state method in order to harness the unutilized part of solar spectrum. The structural and optical studies such as X-Ray diffraction (XRD), Photoluminescence (PL), Up-conversion (UC) and UV-Vis diffuse reflectance characterizations were carried out to examine the prepared sample. The structural refinement of XRD powder data of prepared phosphor was also performed with space group I41a(88). The sample was characterized by dual excitation i.e. UV and IR radiation that shows green emission corresponds to 5D4-7F5 transition of Tb3+ ions. The obtained results indicate that synthesized material can be used as spectral converter to convert unutilized incident solar photons into the energies that are more effectively absorbed by the solar cell, hence efficiency can be improved.The insufficient utilization of incident solar radiation in UV and IR region by existing single-junction photovoltaic devices restrict their efficiency. The triple molybdate NaCaLa(MoO4)3:Tb3+/Yb3+ phosphor was synthesized by solid state method in order to harness the unutilized part of solar spectrum. The structural and optical studies such as X-Ray diffraction (XRD), Photoluminescence (PL), Up-conversion (UC) and UV-Vis diffuse reflectance characterizations were carried out to examine the prepared sample. The structural refinement of XRD powder data of prepared phosphor was also performed with space group I41a(88). The sample was characterized by dual excitation i.e. UV and IR radiation that shows green emission corresponds to 5D4-7F5 transition of Tb3+ ions. The obtained results indicate that synthesized material can be used as spectral converter to convert unutilized incident solar photons into the energies that are more effectively absorbed by the solar cell, hence efficiency can be improved.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"76 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91477311","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}
S. Tiwary, S. Kuila, M. R. Sahoo, A. Barik, P. D. Babu, P. N. Vishwakarma
In the continuation of our recently published work [Tiwary et al., J. Appl. Phys. 124, 044101 (2018)] on triphasic La2NiMnO6, here we are reporting the magnetodielectric and magnetoelectric propert...
在我们最近发表的工作的延续中[Tiwary et al.， J. appll .]在此，我们报告了三相La2NiMnO6的磁介电性和磁电性。物理学报，124,044101 (2018)]
{"title":"PVDF impregnated La2NiMnO6 as a new form of magnetoelectric materials","authors":"S. Tiwary, S. Kuila, M. R. Sahoo, A. Barik, P. D. Babu, P. N. Vishwakarma","doi":"10.1063/1.5112909","DOIUrl":"https://doi.org/10.1063/1.5112909","url":null,"abstract":"In the continuation of our recently published work [Tiwary et al., J. Appl. Phys. 124, 044101 (2018)] on triphasic La2NiMnO6, here we are reporting the magnetodielectric and magnetoelectric propert...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83358585","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}
H. Vijeth, S. Ashokkumar, L. Yesappa, M. Vandana, H. Devendrappa
Polythiophene/ Aluminium oxide (PA) nanocomposite is prepared using in-situ chemical polymerization method using camphor sulfonic acid as surfactant. The prepared samples were characterized using a UV-Visible spectrophotometer which shows a band gap of 3.64 and 3.80 eV for pure PTH and PA nanocomposite respectively. The photocatalytic activity of PA nanocomposite enhances the photocatalytic degradation of Methylene blue (MB) and Rhodamine B (RhB) dye under visible and UV light illuminations than the pure PTH.Polythiophene/ Aluminium oxide (PA) nanocomposite is prepared using in-situ chemical polymerization method using camphor sulfonic acid as surfactant. The prepared samples were characterized using a UV-Visible spectrophotometer which shows a band gap of 3.64 and 3.80 eV for pure PTH and PA nanocomposite respectively. The photocatalytic activity of PA nanocomposite enhances the photocatalytic degradation of Methylene blue (MB) and Rhodamine B (RhB) dye under visible and UV light illuminations than the pure PTH.
{"title":"Photocatalytic degradation of methylene blue and Rhodamine B using polythiophene nanocomposites under visible and UV light","authors":"H. Vijeth, S. Ashokkumar, L. Yesappa, M. Vandana, H. Devendrappa","doi":"10.1063/1.5113375","DOIUrl":"https://doi.org/10.1063/1.5113375","url":null,"abstract":"Polythiophene/ Aluminium oxide (PA) nanocomposite is prepared using in-situ chemical polymerization method using camphor sulfonic acid as surfactant. The prepared samples were characterized using a UV-Visible spectrophotometer which shows a band gap of 3.64 and 3.80 eV for pure PTH and PA nanocomposite respectively. The photocatalytic activity of PA nanocomposite enhances the photocatalytic degradation of Methylene blue (MB) and Rhodamine B (RhB) dye under visible and UV light illuminations than the pure PTH.Polythiophene/ Aluminium oxide (PA) nanocomposite is prepared using in-situ chemical polymerization method using camphor sulfonic acid as surfactant. The prepared samples were characterized using a UV-Visible spectrophotometer which shows a band gap of 3.64 and 3.80 eV for pure PTH and PA nanocomposite respectively. The photocatalytic activity of PA nanocomposite enhances the photocatalytic degradation of Methylene blue (MB) and Rhodamine B (RhB) dye under visible and UV light illuminations than the pure PTH.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86937174","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}
Ashima, S. Dagar, D. Verma, H. Dhull, A. Yadav, S. Khasa
Ni1-x-yCuxZnyFe2O4 spinel ferrites have been prepared through solid-state reaction method. The XRD diffraction pattern and Rietveld refinement analysis of the samples revealed the formation of single crystalline phase of the spinel ferrite having Fd3m space group. The lattice constant (a), X-ray density (ρx), volume of unit cell (V) of the developed ferrite samples have been determined with the help XRD data. The electrical conductivity (σdc) was measured as a function of temperature. The behavior of the dc conductivity was explained on the basis of hopping mechanism of charge carriers. The value of dc conductivity was found to be increases as the temperature increases. It also increases with increase in the concentration of Zn and Ni. The value of activation energy was calculated from the Arrhenius curve of σdc.Ni1-x-yCuxZnyFe2O4 spinel ferrites have been prepared through solid-state reaction method. The XRD diffraction pattern and Rietveld refinement analysis of the samples revealed the formation of single crystalline phase of the spinel ferrite having Fd3m space group. The lattice constant (a), X-ray density (ρx), volume of unit cell (V) of the developed ferrite samples have been determined with the help XRD data. The electrical conductivity (σdc) was measured as a function of temperature. The behavior of the dc conductivity was explained on the basis of hopping mechanism of charge carriers. The value of dc conductivity was found to be increases as the temperature increases. It also increases with increase in the concentration of Zn and Ni. The value of activation energy was calculated from the Arrhenius curve of σdc.
{"title":"Crystal structure refinement and electrical properties of Ni1-x-yCuxZnyFe2O4 spinel ferrites","authors":"Ashima, S. Dagar, D. Verma, H. Dhull, A. Yadav, S. Khasa","doi":"10.1063/1.5112950","DOIUrl":"https://doi.org/10.1063/1.5112950","url":null,"abstract":"Ni1-x-yCuxZnyFe2O4 spinel ferrites have been prepared through solid-state reaction method. The XRD diffraction pattern and Rietveld refinement analysis of the samples revealed the formation of single crystalline phase of the spinel ferrite having Fd3m space group. The lattice constant (a), X-ray density (ρx), volume of unit cell (V) of the developed ferrite samples have been determined with the help XRD data. The electrical conductivity (σdc) was measured as a function of temperature. The behavior of the dc conductivity was explained on the basis of hopping mechanism of charge carriers. The value of dc conductivity was found to be increases as the temperature increases. It also increases with increase in the concentration of Zn and Ni. The value of activation energy was calculated from the Arrhenius curve of σdc.Ni1-x-yCuxZnyFe2O4 spinel ferrites have been prepared through solid-state reaction method. The XRD diffraction pattern and Rietveld refinement analysis of the samples revealed the formation of single crystalline phase of the spinel ferrite having Fd3m space group. The lattice constant (a), X-ray density (ρx), volume of unit cell (V) of the developed ferrite samples have been determined with the help XRD data. The electrical conductivity (σdc) was measured as a function of temperature. The behavior of the dc conductivity was explained on the basis of hopping mechanism of charge carriers. The value of dc conductivity was found to be increases as the temperature increases. It also increases with increase in the concentration of Zn and Ni. The value of activation energy was calculated from the Arrhenius curve of σdc.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85358746","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}
Epitaxial Gallium nitride (GaN) films were deposited on c-plane sapphire by rf magnetron sputtering using GaAs target with different percentages (10 - 100 %) of nitrogen in Ar-N2 sputtering atmosphere at a substrate temperature of 700 °C. Powder X-ray diffraction studies show the formation of single phase GaN films, which are practically strain free when grown with 20 - 50 % nitrogen in sputtering atmosphere. The surface morphology of the films was studied by atomic force microscopy and the epitaxial quality of the films was ascertained by high resolution X-ray diffraction. The microstructural parameters of the films, such as crystallite tilt, microstrain as well as lateral and vertical coherence lengths were obtained from ω and ω -2θ scans and the corresponding Williamson-Hall plots. These studies reveal that the surface topography and epitaxial quality of the films depend significantly on the percentage of nitrogen in sputtering atmosphere, with the film deposited with 50 % nitrogen exhibiting substanti...
{"title":"Effect of nitrogen partial pressure on the microstructure of epitaxial GaN films grown by rf magnetron sputtering","authors":"M. Monish, S. Mohan, S. Major","doi":"10.1063/1.5113155","DOIUrl":"https://doi.org/10.1063/1.5113155","url":null,"abstract":"Epitaxial Gallium nitride (GaN) films were deposited on c-plane sapphire by rf magnetron sputtering using GaAs target with different percentages (10 - 100 %) of nitrogen in Ar-N2 sputtering atmosphere at a substrate temperature of 700 °C. Powder X-ray diffraction studies show the formation of single phase GaN films, which are practically strain free when grown with 20 - 50 % nitrogen in sputtering atmosphere. The surface morphology of the films was studied by atomic force microscopy and the epitaxial quality of the films was ascertained by high resolution X-ray diffraction. The microstructural parameters of the films, such as crystallite tilt, microstrain as well as lateral and vertical coherence lengths were obtained from ω and ω -2θ scans and the corresponding Williamson-Hall plots. These studies reveal that the surface topography and epitaxial quality of the films depend significantly on the percentage of nitrogen in sputtering atmosphere, with the film deposited with 50 % nitrogen exhibiting substanti...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90450053","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}
Anuradha Bhogra, Anha Masarrat, R. Meena, Dilruba Hasina, T. Som, K. Asokan
The Ar ion irradiation induced effects in thermoelectric properties of TiO2/STO bilayer have been investigated by X-ray Diffraction, alongwith X-ray Absorption spectroscopy. The bilayer was deposited on silicon substrate by Pulsed laser deposition at a substrate temperature of 700°C and then irradiated by using 1 MeV Ar ion beam at a fluence of 1×1016 ions/cm2. The Seebeck coefficient and resistivity measurements were performed by the bridge method and two probe measurements. It was found that resistivity of the bilayer drastically reduces after Ar irradiation and Seebeck coefficient enhances significantly compared to the bulk SrTiO3.The Ar ion irradiation induced effects in thermoelectric properties of TiO2/STO bilayer have been investigated by X-ray Diffraction, alongwith X-ray Absorption spectroscopy. The bilayer was deposited on silicon substrate by Pulsed laser deposition at a substrate temperature of 700°C and then irradiated by using 1 MeV Ar ion beam at a fluence of 1×1016 ions/cm2. The Seebeck coefficient and resistivity measurements were performed by the bridge method and two probe measurements. It was found that resistivity of the bilayer drastically reduces after Ar irradiation and Seebeck coefficient enhances significantly compared to the bulk SrTiO3.
{"title":"Enhancement of thermoelectric properties of TiO2/SrTiO3 bilayer after Ar ion irradiation","authors":"Anuradha Bhogra, Anha Masarrat, R. Meena, Dilruba Hasina, T. Som, K. Asokan","doi":"10.1063/1.5113439","DOIUrl":"https://doi.org/10.1063/1.5113439","url":null,"abstract":"The Ar ion irradiation induced effects in thermoelectric properties of TiO2/STO bilayer have been investigated by X-ray Diffraction, alongwith X-ray Absorption spectroscopy. The bilayer was deposited on silicon substrate by Pulsed laser deposition at a substrate temperature of 700°C and then irradiated by using 1 MeV Ar ion beam at a fluence of 1×1016 ions/cm2. The Seebeck coefficient and resistivity measurements were performed by the bridge method and two probe measurements. It was found that resistivity of the bilayer drastically reduces after Ar irradiation and Seebeck coefficient enhances significantly compared to the bulk SrTiO3.The Ar ion irradiation induced effects in thermoelectric properties of TiO2/STO bilayer have been investigated by X-ray Diffraction, alongwith X-ray Absorption spectroscopy. The bilayer was deposited on silicon substrate by Pulsed laser deposition at a substrate temperature of 700°C and then irradiated by using 1 MeV Ar ion beam at a fluence of 1×1016 ions/cm2. The Seebeck coefficient and resistivity measurements were performed by the bridge method and two probe measurements. It was found that resistivity of the bilayer drastically reduces after Ar irradiation and Seebeck coefficient enhances significantly compared to the bulk SrTiO3.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76589002","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}
Methylamionium iodo bismuthate (MBI) perovskite is a promising alternative of hybrid organic-inorganic lead perovskite devices because of its better stability and low toxicity compared to lead based perovskite. Spray deposition technique was used to deposit lead free Bismuth Iodide Perovskite thin film with different thickness. The crystal structure of the MBI perovskite was determined from X-ray diffraction measurement. The diffraction peaks well matched with the literature values, which were solved in the P63/mmc space group. The optical absorption measurement showed the absorption band around 500 nm in all the samples. The higher absorption due to increasing the thickness of the perovskite films. The film roughness is decreased with increasing the film thickness. The power conversion efficiency corresponding to best spray deposited lead free perovskite film is observed 0.06%.Methylamionium iodo bismuthate (MBI) perovskite is a promising alternative of hybrid organic-inorganic lead perovskite devices because of its better stability and low toxicity compared to lead based perovskite. Spray deposition technique was used to deposit lead free Bismuth Iodide Perovskite thin film with different thickness. The crystal structure of the MBI perovskite was determined from X-ray diffraction measurement. The diffraction peaks well matched with the literature values, which were solved in the P63/mmc space group. The optical absorption measurement showed the absorption band around 500 nm in all the samples. The higher absorption due to increasing the thickness of the perovskite films. The film roughness is decreased with increasing the film thickness. The power conversion efficiency corresponding to best spray deposited lead free perovskite film is observed 0.06%.
{"title":"Effect of film thickness on the properties of bismuth iodide perovskite film for solar cell application","authors":"Tauheed Mohammad, Vinod Kumar, V. Dutta","doi":"10.1063/1.5113378","DOIUrl":"https://doi.org/10.1063/1.5113378","url":null,"abstract":"Methylamionium iodo bismuthate (MBI) perovskite is a promising alternative of hybrid organic-inorganic lead perovskite devices because of its better stability and low toxicity compared to lead based perovskite. Spray deposition technique was used to deposit lead free Bismuth Iodide Perovskite thin film with different thickness. The crystal structure of the MBI perovskite was determined from X-ray diffraction measurement. The diffraction peaks well matched with the literature values, which were solved in the P63/mmc space group. The optical absorption measurement showed the absorption band around 500 nm in all the samples. The higher absorption due to increasing the thickness of the perovskite films. The film roughness is decreased with increasing the film thickness. The power conversion efficiency corresponding to best spray deposited lead free perovskite film is observed 0.06%.Methylamionium iodo bismuthate (MBI) perovskite is a promising alternative of hybrid organic-inorganic lead perovskite devices because of its better stability and low toxicity compared to lead based perovskite. Spray deposition technique was used to deposit lead free Bismuth Iodide Perovskite thin film with different thickness. The crystal structure of the MBI perovskite was determined from X-ray diffraction measurement. The diffraction peaks well matched with the literature values, which were solved in the P63/mmc space group. The optical absorption measurement showed the absorption band around 500 nm in all the samples. The higher absorption due to increasing the thickness of the perovskite films. The film roughness is decreased with increasing the film thickness. The power conversion efficiency corresponding to best spray deposited lead free perovskite film is observed 0.06%.","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":"76804347","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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