Using self-ignited auto-combustion method, Cd doped Ni-Zn Ferrite nano-structures were prepared. Samples were characterized to determine their composition dependent structural and magnetic properties. XRD patterns of as-prepared specimens’ revealed cubic spinel structure (single phase). Raman spectra disclosed five active modes consistent to the spinel phase. Magnetic properties of these ferrites were determined in terms of saturation magnetization, magnetic moment. Mossbauer spectra recorded at 300 K temperature Variations of isomer shift, hyperfine field, quadrupole splitting and line width are analyzed with the amount of doped Cadmium.Using self-ignited auto-combustion method, Cd doped Ni-Zn Ferrite nano-structures were prepared. Samples were characterized to determine their composition dependent structural and magnetic properties. XRD patterns of as-prepared specimens’ revealed cubic spinel structure (single phase). Raman spectra disclosed five active modes consistent to the spinel phase. Magnetic properties of these ferrites were determined in terms of saturation magnetization, magnetic moment. Mossbauer spectra recorded at 300 K temperature Variations of isomer shift, hyperfine field, quadrupole splitting and line width are analyzed with the amount of doped Cadmium.
{"title":"Studies on composition dependent structural and magnetic characterization of nano-crystalline cadmium doped nickel ferrite","authors":"R. Tiwari, Manojit De, H. S. Tewari","doi":"10.1063/1.5112941","DOIUrl":"https://doi.org/10.1063/1.5112941","url":null,"abstract":"Using self-ignited auto-combustion method, Cd doped Ni-Zn Ferrite nano-structures were prepared. Samples were characterized to determine their composition dependent structural and magnetic properties. XRD patterns of as-prepared specimens’ revealed cubic spinel structure (single phase). Raman spectra disclosed five active modes consistent to the spinel phase. Magnetic properties of these ferrites were determined in terms of saturation magnetization, magnetic moment. Mossbauer spectra recorded at 300 K temperature Variations of isomer shift, hyperfine field, quadrupole splitting and line width are analyzed with the amount of doped Cadmium.Using self-ignited auto-combustion method, Cd doped Ni-Zn Ferrite nano-structures were prepared. Samples were characterized to determine their composition dependent structural and magnetic properties. XRD patterns of as-prepared specimens’ revealed cubic spinel structure (single phase). Raman spectra disclosed five active modes consistent to the spinel phase. Magnetic properties of these ferrites were determined in terms of saturation magnetization, magnetic moment. Mossbauer spectra recorded at 300 K temperature Variations of isomer shift, hyperfine field, quadrupole splitting and line width are analyzed with the amount of doped Cadmium.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78519425","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}
Parminder Kaur, Kulbir Singh, M. Kurudirek, Sonika Thakur
Bismuth modified phosphate glass system containing calcium and potassium was prepared and assessed for its applicability as transparent viewing windows for shielding against gamma-rays and neutrons in nuclear reactors. The structure of the glasses was studied by density, XRD and FTIR techniques. The gamma-ray shielding properties were studied at energies 356 and 662 keV both experimentally and theoretically (by XCOM and XMuDat programs) and compared with commonly used barite concrete. Exposure buildup factor was also investigated. The neutron shielding properties were studied and compared with some common neutron shielding materials (Boron Carbide, Polyethylene grains and ordinary concrete). Results indicate that the studied glasses with 0.2, 0.25, 0.3 wt. fraction Bi2O3 are potential candidates for gamma-ray and neutron shielding applications.
{"title":"Gamma-ray and neutron shielding behaviour of CaO-K2O-P2O5 glass system modified with Bi2O3","authors":"Parminder Kaur, Kulbir Singh, M. Kurudirek, Sonika Thakur","doi":"10.1063/1.5113090","DOIUrl":"https://doi.org/10.1063/1.5113090","url":null,"abstract":"Bismuth modified phosphate glass system containing calcium and potassium was prepared and assessed for its applicability as transparent viewing windows for shielding against gamma-rays and neutrons in nuclear reactors. The structure of the glasses was studied by density, XRD and FTIR techniques. The gamma-ray shielding properties were studied at energies 356 and 662 keV both experimentally and theoretically (by XCOM and XMuDat programs) and compared with commonly used barite concrete. Exposure buildup factor was also investigated. The neutron shielding properties were studied and compared with some common neutron shielding materials (Boron Carbide, Polyethylene grains and ordinary concrete). Results indicate that the studied glasses with 0.2, 0.25, 0.3 wt. fraction Bi2O3 are potential candidates for gamma-ray and neutron shielding applications.","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":"73319093","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}
Structural and light up-conversion properties of Ba(Sn.06Ti0.94)O3 and Ba.995Er.005(Sn.06Ti0.94)O3 compositions prepared by solid-state reaction method are compared. X-ray diffraction confirms single phase formation with an orthorhombic structure in both the compositions, and with the additional Er3+ dopant at the A-site the ortho-rhombic distortion (b/a) is found to increase from 1.414 to 1.420. Infrared to visible light up-conversion (UC) is observed under excitation with a 980 nm diode laser at room temperature. The observed weak red emission at 662 nm, and the two strong green emission bands at 525 nm and 550 nm are attributed to the transitions 4F9/2 → 4I15/2 and 4H11/2→4I15/2, 4S3/2→4I15/2 respectively and the dependence of up-conversion emission on laser power (50-130 mW) indicates a two-photon absorption and interaction. The two dopants (Sn and Er) are found to be promising for developing an efficient mechano-luminescent material.Structural and light up-conversion properties of Ba(Sn.06Ti0.94)O3 and Ba.995Er.005(Sn.06Ti0.94)O3 compositions prepared by solid-state reaction method are compared. X-ray diffraction confirms single phase formation with an orthorhombic structure in both the compositions, and with the additional Er3+ dopant at the A-site the ortho-rhombic distortion (b/a) is found to increase from 1.414 to 1.420. Infrared to visible light up-conversion (UC) is observed under excitation with a 980 nm diode laser at room temperature. The observed weak red emission at 662 nm, and the two strong green emission bands at 525 nm and 550 nm are attributed to the transitions 4F9/2 → 4I15/2 and 4H11/2→4I15/2, 4S3/2→4I15/2 respectively and the dependence of up-conversion emission on laser power (50-130 mW) indicates a two-photon absorption and interaction. The two dopants (Sn and Er) are found to be promising for developing an efficient mechano-luminescent material.
{"title":"Light up-conversion and structural properties of Sn and Er3+ doped Ba.995 Er.005 (Sn.06Ti.94)O3 ceramics","authors":"M. A. Ansari, K. Sreenivas","doi":"10.1063/1.5112840","DOIUrl":"https://doi.org/10.1063/1.5112840","url":null,"abstract":"Structural and light up-conversion properties of Ba(Sn.06Ti0.94)O3 and Ba.995Er.005(Sn.06Ti0.94)O3 compositions prepared by solid-state reaction method are compared. X-ray diffraction confirms single phase formation with an orthorhombic structure in both the compositions, and with the additional Er3+ dopant at the A-site the ortho-rhombic distortion (b/a) is found to increase from 1.414 to 1.420. Infrared to visible light up-conversion (UC) is observed under excitation with a 980 nm diode laser at room temperature. The observed weak red emission at 662 nm, and the two strong green emission bands at 525 nm and 550 nm are attributed to the transitions 4F9/2 → 4I15/2 and 4H11/2→4I15/2, 4S3/2→4I15/2 respectively and the dependence of up-conversion emission on laser power (50-130 mW) indicates a two-photon absorption and interaction. The two dopants (Sn and Er) are found to be promising for developing an efficient mechano-luminescent material.Structural and light up-conversion properties of Ba(Sn.06Ti0.94)O3 and Ba.995Er.005(Sn.06Ti0.94)O3 compositions prepared by solid-state reaction method are compared. X-ray diffraction confirms single phase formation with an orthorhombic structure in both the compositions, and with the additional Er3+ dopant at the A-site the ortho-rhombic distortion (b/a) is found to increase from 1.414 to 1.420. Infrared to visible light up-conversion (UC) is observed under excitation with a 980 nm diode laser at room temperature. The observed weak red emission at 662 nm, and the two strong green emission bands at 525 nm and 550 nm are attributed to the transitions 4F9/2 → 4I15/2 and 4H11/2→4I15/2, 4S3/2→4I15/2 respectively and the dependence of up-conversion emission on laser power (50-130 mW) indicates a two-photon absorption and interaction. The two dopants (Sn and Er) are found to be promising for developing an efficient mechano-luminescent material.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"89 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84206511","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 have fabricated ordered array of ferromagnetic nanodots, so-called nanobumps by depositing Ta(5nm)/Pt(5nm)/Co88Tb12(5nm)/Cu(2nm)/Pt(5nm) mutilayers onto the barrier layer of auto-assembled anodic alumina template with 100 nm period. The same multilayers was deposited on a flat Si/SiOx substrate (the so-called reference sample) for comparison. We used extraordinary Hall Effect (EHE) measurements to probe magnetization reversal mechanism and switching field distribution (SFD) of these two kinds of materials. The extraordinary Hall resistivity measurements were performed by a standard four-probe method. The measurement of the coercivity as a function of magnetic field angle with respect to the sample surface reveal that ferromagnetic nanodots follow Stoner-Wohlfarth model with a shallower variation, which is typical of a dot-by-dot reversal but with a nucleation/propagation process for each dot. On the other hand, multilayers deposited on flat substrate follow Kondorskey model, which indicate nucleation/ propagation type reversal. Finally, we have calculated switching field distribution for nanobump material.We have fabricated ordered array of ferromagnetic nanodots, so-called nanobumps by depositing Ta(5nm)/Pt(5nm)/Co88Tb12(5nm)/Cu(2nm)/Pt(5nm) mutilayers onto the barrier layer of auto-assembled anodic alumina template with 100 nm period. The same multilayers was deposited on a flat Si/SiOx substrate (the so-called reference sample) for comparison. We used extraordinary Hall Effect (EHE) measurements to probe magnetization reversal mechanism and switching field distribution (SFD) of these two kinds of materials. The extraordinary Hall resistivity measurements were performed by a standard four-probe method. The measurement of the coercivity as a function of magnetic field angle with respect to the sample surface reveal that ferromagnetic nanodots follow Stoner-Wohlfarth model with a shallower variation, which is typical of a dot-by-dot reversal but with a nucleation/propagation process for each dot. On the other hand, multilayers deposited on flat substrate follow Kondorskey model, which indicate nucleation/ ...
{"title":"Magnetization reversal and switching field distribution in Co-Tb based bit patterned media","authors":"S. Srivastava, R. Hussain, T. Hauet, L. Piraux","doi":"10.1063/1.5113321","DOIUrl":"https://doi.org/10.1063/1.5113321","url":null,"abstract":"We have fabricated ordered array of ferromagnetic nanodots, so-called nanobumps by depositing Ta(5nm)/Pt(5nm)/Co88Tb12(5nm)/Cu(2nm)/Pt(5nm) mutilayers onto the barrier layer of auto-assembled anodic alumina template with 100 nm period. The same multilayers was deposited on a flat Si/SiOx substrate (the so-called reference sample) for comparison. We used extraordinary Hall Effect (EHE) measurements to probe magnetization reversal mechanism and switching field distribution (SFD) of these two kinds of materials. The extraordinary Hall resistivity measurements were performed by a standard four-probe method. The measurement of the coercivity as a function of magnetic field angle with respect to the sample surface reveal that ferromagnetic nanodots follow Stoner-Wohlfarth model with a shallower variation, which is typical of a dot-by-dot reversal but with a nucleation/propagation process for each dot. On the other hand, multilayers deposited on flat substrate follow Kondorskey model, which indicate nucleation/ propagation type reversal. Finally, we have calculated switching field distribution for nanobump material.We have fabricated ordered array of ferromagnetic nanodots, so-called nanobumps by depositing Ta(5nm)/Pt(5nm)/Co88Tb12(5nm)/Cu(2nm)/Pt(5nm) mutilayers onto the barrier layer of auto-assembled anodic alumina template with 100 nm period. The same multilayers was deposited on a flat Si/SiOx substrate (the so-called reference sample) for comparison. We used extraordinary Hall Effect (EHE) measurements to probe magnetization reversal mechanism and switching field distribution (SFD) of these two kinds of materials. The extraordinary Hall resistivity measurements were performed by a standard four-probe method. The measurement of the coercivity as a function of magnetic field angle with respect to the sample surface reveal that ferromagnetic nanodots follow Stoner-Wohlfarth model with a shallower variation, which is typical of a dot-by-dot reversal but with a nucleation/propagation process for each dot. On the other hand, multilayers deposited on flat substrate follow Kondorskey model, which indicate nucleation/ ...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84149521","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}
Muskan Nabi, Tahir Mohiuddin Bhat, Saleem Yousuf, S. Singh, Z. Saleem, S. Mir, S. A. Khandy, A. Q. Seh, S. Sofi, D. Gupta
The electronic structure and transport properties of Fe2TiSn Heusler alloy are investigated by means of ab-initio calculations. Fe2TiSn alloy crystallize in Fm-3m structure with the lattice constant of 6.02 A. The spin-polarized electronic band structure for both spin states divulges that Fe2TiSn is an indirect band gap semiconductor with a band gap of 0.6 eV. Influence of pressure shows extensive effect on the electronic structure, though no magnetic transition was observed. Increasing the pressure significantly reduces the band gap of the material, beyond 30 GPa Fe2TiSn becomes metallic in nature. The effect of varying chemical potential on the Seebeck coefficient and power factor were also observed. Fe2TiSn Heusler alloy presents decent Seebeck coefficient and power factor, with both n-type as well as p-type are ideal for achieving high thermoelectric performance.The electronic structure and transport properties of Fe2TiSn Heusler alloy are investigated by means of ab-initio calculations. Fe2TiSn alloy crystallize in Fm-3m structure with the lattice constant of 6.02 A. The spin-polarized electronic band structure for both spin states divulges that Fe2TiSn is an indirect band gap semiconductor with a band gap of 0.6 eV. Influence of pressure shows extensive effect on the electronic structure, though no magnetic transition was observed. Increasing the pressure significantly reduces the band gap of the material, beyond 30 GPa Fe2TiSn becomes metallic in nature. The effect of varying chemical potential on the Seebeck coefficient and power factor were also observed. Fe2TiSn Heusler alloy presents decent Seebeck coefficient and power factor, with both n-type as well as p-type are ideal for achieving high thermoelectric performance.
{"title":"Effect of high pressure on the structural, and thermoelectric properties of Fe2TiSn Heusler alloy","authors":"Muskan Nabi, Tahir Mohiuddin Bhat, Saleem Yousuf, S. Singh, Z. Saleem, S. Mir, S. A. Khandy, A. Q. Seh, S. Sofi, D. Gupta","doi":"10.1063/1.5113267","DOIUrl":"https://doi.org/10.1063/1.5113267","url":null,"abstract":"The electronic structure and transport properties of Fe2TiSn Heusler alloy are investigated by means of ab-initio calculations. Fe2TiSn alloy crystallize in Fm-3m structure with the lattice constant of 6.02 A. The spin-polarized electronic band structure for both spin states divulges that Fe2TiSn is an indirect band gap semiconductor with a band gap of 0.6 eV. Influence of pressure shows extensive effect on the electronic structure, though no magnetic transition was observed. Increasing the pressure significantly reduces the band gap of the material, beyond 30 GPa Fe2TiSn becomes metallic in nature. The effect of varying chemical potential on the Seebeck coefficient and power factor were also observed. Fe2TiSn Heusler alloy presents decent Seebeck coefficient and power factor, with both n-type as well as p-type are ideal for achieving high thermoelectric performance.The electronic structure and transport properties of Fe2TiSn Heusler alloy are investigated by means of ab-initio calculations. Fe2TiSn alloy crystallize in Fm-3m structure with the lattice constant of 6.02 A. The spin-polarized electronic band structure for both spin states divulges that Fe2TiSn is an indirect band gap semiconductor with a band gap of 0.6 eV. Influence of pressure shows extensive effect on the electronic structure, though no magnetic transition was observed. Increasing the pressure significantly reduces the band gap of the material, beyond 30 GPa Fe2TiSn becomes metallic in nature. The effect of varying chemical potential on the Seebeck coefficient and power factor were also observed. Fe2TiSn Heusler alloy presents decent Seebeck coefficient and power factor, with both n-type as well as p-type are ideal for achieving high thermoelectric performance.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"122 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84181444","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 structural, electronic, magnetic and optical properties of ferromagnetic states of CuCrO2, AgCrO2 and AuCrO2 have been investigated by the state-of-the-art first principles calculations based on density functional theory. The optimized lattice parameters and electronic band gap agree well with the experimental and other theoretical data for CuCrO2 and AgCrO2. There is no reported data available for AuCrO2. The spin polarized electronic density of states (DOS) with the majority and minority spin depicts a semiconducting nature of these compounds, with decreasing band gap going from Cu to Ag and Au. Spin polarized density of states shows the magnetic behavior of these compounds. The dielectric constants show significant anisotropy of these compounds in the component of polarization direction. The major peaks in dielectric constants reveal absorption of UV light of solar spectrum which confirms its applications in optical devices.
{"title":"Electronic and optical properties of ferromagnetic CuCrO2, AgCrO2 and AuCrO2","authors":"Deepak Upadhyay, A. Pratap, P. Jha","doi":"10.1063/1.5113355","DOIUrl":"https://doi.org/10.1063/1.5113355","url":null,"abstract":"The structural, electronic, magnetic and optical properties of ferromagnetic states of CuCrO2, AgCrO2 and AuCrO2 have been investigated by the state-of-the-art first principles calculations based on density functional theory. The optimized lattice parameters and electronic band gap agree well with the experimental and other theoretical data for CuCrO2 and AgCrO2. There is no reported data available for AuCrO2. The spin polarized electronic density of states (DOS) with the majority and minority spin depicts a semiconducting nature of these compounds, with decreasing band gap going from Cu to Ag and Au. Spin polarized density of states shows the magnetic behavior of these compounds. The dielectric constants show significant anisotropy of these compounds in the component of polarization direction. The major peaks in dielectric constants reveal absorption of UV light of solar spectrum which confirms its applications in optical devices.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85389170","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. Ashokkumar, H. Vijeth, L. Yesappa, M. Vandana, H. Devendrappa
A Polyaniline/copper oxide nanocomposites (PCN) has been prepared by electrochemical deposition method. The optical, chemical interaction, morphological and structural properties of Polyaniline (PANI) and PCN nano composites were done using UV-Visible absorption, FT-IR, FESEM and XRD respectively. The results show that decreasing optical band gaps with increasing CuO nano particles into PANi matrix and these polymer nanocomposites are suitable for super capacitor, optoelectronics, solar cell, sensor, and other storage devices applications.
{"title":"Lower optical band gap and morphology of electrochemically synthesized polyaniline/CuO nanocomposites","authors":"S. Ashokkumar, H. Vijeth, L. Yesappa, M. Vandana, H. Devendrappa","doi":"10.1063/1.5112898","DOIUrl":"https://doi.org/10.1063/1.5112898","url":null,"abstract":"A Polyaniline/copper oxide nanocomposites (PCN) has been prepared by electrochemical deposition method. The optical, chemical interaction, morphological and structural properties of Polyaniline (PANI) and PCN nano composites were done using UV-Visible absorption, FT-IR, FESEM and XRD respectively. The results show that decreasing optical band gaps with increasing CuO nano particles into PANi matrix and these polymer nanocomposites are suitable for super capacitor, optoelectronics, solar cell, sensor, and other storage devices applications.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"95 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81826328","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. Rani, R. Kundu, N. Ahlawat, S. Rani, Kanta Maan Sangwan, K. Rani
A quaternary glass system with compositions TeO2-Bi2O3-B2O3-BaO has been prepared by melt-quench method. The calculated values of density, molar volume and crystalline volume were found to increase with bismuth content. The absorption edge shifts towards lower wavelength side for all the compositions except x = 20 mol%. The optical band gap energy has been evaluated from extrapolation of Tauc’s plot results and Urbach energy has been estimated from linear fitting. The other optical parameters such as refractive index, molar refractivity and metallization criterion have also been discussed.
{"title":"Bismuth modified physical and optical properties of barium boro-tellurite glasses","authors":"S. Rani, R. Kundu, N. Ahlawat, S. Rani, Kanta Maan Sangwan, K. Rani","doi":"10.1063/1.5113094","DOIUrl":"https://doi.org/10.1063/1.5113094","url":null,"abstract":"A quaternary glass system with compositions TeO2-Bi2O3-B2O3-BaO has been prepared by melt-quench method. The calculated values of density, molar volume and crystalline volume were found to increase with bismuth content. The absorption edge shifts towards lower wavelength side for all the compositions except x = 20 mol%. The optical band gap energy has been evaluated from extrapolation of Tauc’s plot results and Urbach energy has been estimated from linear fitting. The other optical parameters such as refractive index, molar refractivity and metallization criterion have also been discussed.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83728654","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}
Developing high-performance, less expensive, non-precious and nondurable platinum-based electrocatalysts for oxygen reduction reaction (ORR) at the cathode side is an important issue in commercialization fuel cell technology. Here we introduce MOF1, 1, 3, 5-tricarboxylic acid (H3BTC) and zinc metal-based metal-organic framework which functions as a well-defined, tunable oxygen reduction electrocatalyst in alkaline solution. The catalytic activity of the MOF1 electrocatalyst toward the ORR in an alkaline electrolyte is tested using RRDE technique. MOF1 in alkaline media shows excellent activity and stability for ORR followed by the two-electron reduction pathway to the generation of hydrogen peroxide and the peroxide oxidation current on the ring electrode increases with cycling. The results are in support with Koutecky-Levich plots and the voltammograms.Developing high-performance, less expensive, non-precious and nondurable platinum-based electrocatalysts for oxygen reduction reaction (ORR) at the cathode side is an important issue in commercialization fuel cell technology. Here we introduce MOF1, 1, 3, 5-tricarboxylic acid (H3BTC) and zinc metal-based metal-organic framework which functions as a well-defined, tunable oxygen reduction electrocatalyst in alkaline solution. The catalytic activity of the MOF1 electrocatalyst toward the ORR in an alkaline electrolyte is tested using RRDE technique. MOF1 in alkaline media shows excellent activity and stability for ORR followed by the two-electron reduction pathway to the generation of hydrogen peroxide and the peroxide oxidation current on the ring electrode increases with cycling. The results are in support with Koutecky-Levich plots and the voltammograms.
{"title":"Hydrogen peroxide (H2O2) production in oxygen reduction reaction (ORR) proceeding in alkaline medium employing zinc based metal-organic framework","authors":"D. Das, V. Raut","doi":"10.1063/1.5113385","DOIUrl":"https://doi.org/10.1063/1.5113385","url":null,"abstract":"Developing high-performance, less expensive, non-precious and nondurable platinum-based electrocatalysts for oxygen reduction reaction (ORR) at the cathode side is an important issue in commercialization fuel cell technology. Here we introduce MOF1, 1, 3, 5-tricarboxylic acid (H3BTC) and zinc metal-based metal-organic framework which functions as a well-defined, tunable oxygen reduction electrocatalyst in alkaline solution. The catalytic activity of the MOF1 electrocatalyst toward the ORR in an alkaline electrolyte is tested using RRDE technique. MOF1 in alkaline media shows excellent activity and stability for ORR followed by the two-electron reduction pathway to the generation of hydrogen peroxide and the peroxide oxidation current on the ring electrode increases with cycling. The results are in support with Koutecky-Levich plots and the voltammograms.Developing high-performance, less expensive, non-precious and nondurable platinum-based electrocatalysts for oxygen reduction reaction (ORR) at the cathode side is an important issue in commercialization fuel cell technology. Here we introduce MOF1, 1, 3, 5-tricarboxylic acid (H3BTC) and zinc metal-based metal-organic framework which functions as a well-defined, tunable oxygen reduction electrocatalyst in alkaline solution. The catalytic activity of the MOF1 electrocatalyst toward the ORR in an alkaline electrolyte is tested using RRDE technique. MOF1 in alkaline media shows excellent activity and stability for ORR followed by the two-electron reduction pathway to the generation of hydrogen peroxide and the peroxide oxidation current on the ring electrode increases with cycling. The results are in support with Koutecky-Levich plots and the voltammograms.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82643258","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. Joshi, K. Sharma, H. Nayyar, K. Dharamvir, G. Verma
The efficiency of biological sensitivity in medical therapy purely depends on the development of the precise and suitable drug delivery systems. The present work was purposeful toward the formation of biocomposites using biological probe liposomes and nano carrier carbon nanofiber in order to developed deal with nanostructures which can be to be used as vectors for molecules modified weapon toward diseases. Liposomal insitu nanostructure was prepared by thin film hydration method in the presence of functionalized carbon nanofibers. This was studied by TEM (Transmission Electron Microscope), Raman spectra, FTIR, DLS (Dynamic light scattering) and the stability of the nanobiocomposites was measured by zeta potential.
{"title":"Encapsulation of carbon nanofiber inside liposome for target drug delivery","authors":"A. Joshi, K. Sharma, H. Nayyar, K. Dharamvir, G. Verma","doi":"10.1063/1.5112878","DOIUrl":"https://doi.org/10.1063/1.5112878","url":null,"abstract":"The efficiency of biological sensitivity in medical therapy purely depends on the development of the precise and suitable drug delivery systems. The present work was purposeful toward the formation of biocomposites using biological probe liposomes and nano carrier carbon nanofiber in order to developed deal with nanostructures which can be to be used as vectors for molecules modified weapon toward diseases. Liposomal insitu nanostructure was prepared by thin film hydration method in the presence of functionalized carbon nanofibers. This was studied by TEM (Transmission Electron Microscope), Raman spectra, FTIR, DLS (Dynamic light scattering) and the stability of the nanobiocomposites was measured by zeta potential.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80165671","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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