DAE SOLID STATE PHYSICS SYMPOSIUM 2018最新文献

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}