Optimizing energy storage and magnetoelectric performance through core-shell engineering: A study on Ni0.5Co0.5Fe2O4-BaTiO3 multiferroic composite materials
Journal of magnetism and magnetic materials, Apr 1, 2024
Role of structural, morphological, and electronic characteristics in investigating the low temperature transport and magnetic behavior of Sr doped Sm2NiMnO6
International Journal of Modern Physics, May 30, 2022
In this paper, we analyze the effects of expansion on large scale structure formation in our Univ... more In this paper, we analyze the effects of expansion on large scale structure formation in our Universe. We do that by incorporating a cosmological constant term in the gravitational partition function. This gravitational partition function with a cosmological constant is used for analyzing the thermodynamics of this system. We analyze the virial expansion for this system, and obtain its equation of state. It is observed that the generalization of this equation of state is like the Van der Waals equation. We also analyze a gravitational phase transition in this system using the mean field theory. We construct the cosmic energy equation for this system of galaxies, and discuss its consequences. We obtain and analyze the distribution function for this system, using the gravitational partition function. We also compare the results obtained in this paper with the observational data.
Electronic and optical behaviour of anisotropic Nd2NiMnO6 double perovskite: A first principle study
Solid State Communications, Nov 1, 2021
Abstract Double perovskites are interesting in the field of material sciences because of their mu... more Abstract Double perovskites are interesting in the field of material sciences because of their multifunctional properties. Different researches have been done and several investigations have been carried out to explore these compounds. Here in this paper, we have explored one of the less investigated compounds i.e., Nd2NiMnO6. Although few experimental studies have been made and some results have been pointed out, still we are going to explore some properties of Nd2NiMnO6 using Density Functional Approach. Band structure and density of state (DOS) studies of the material in spin up and spin down channels disclose the semiconducting behavior of Nd2NiMnO6. The variation of dielectric constant with frequency and the variation of susceptibility with wavelength have also been presented with the explainable trends. The results also reveal the anisotropic nature in dielectric function and susceptibility of the compound.
Comparative study of optical properties of substitutionally doped La2NiMnO6 double perovskite ceramic: A potential candidate for solar cells and dielectrics
Physica B-condensed Matter, Nov 1, 2021
Abstract With the curiosity to account for transition metal-based oxide double perovskites (A2BB΄... more Abstract With the curiosity to account for transition metal-based oxide double perovskites (A2BB΄O6) as better-performing semiconducting materials for light-driven devices and dielectrics, the study examined the optical properties of La2NiMnO6 doped substitutionally at A sites by Ca and Yb. The study is performed by making use of Density Functional Theory wherein the Local Density Approximation along with columbic corrections (LDA + U) was used to investigate the comparative effect of Ca and Yb dopants at A site of LMNO and the changes observed henceforth are vital keeping in view the effect of change of charge state at A site. The dielectric tensor suggests the isotropic behaviour of the material. In case of applied varying ac fields, the dielectric constant becomes a complex quantity and has two parts viz real and imaginary wherein the real part is associated with the degree of polarization and the imaginary part, on the other hand, is associated with the dielectric losses. The dielectric constants (both real and imaginary) were plotted against the frequency changes and the trends in absorption, refraction, dielectrics, and optical conductivities that emerge from this study have important electronic and optical implications. The dielectric relaxation which arises as a consequence of the inability of the dipoles to cope with the frequent oscillations of the perturbing field makes it possible for the material to be used in memory elements. Furthermore, the simpler and cost-efficient method of preparation (Solid State Reaction) with the high value of dielectric constant and optical conductivities in the visible spectral range favors the use of these materials in the case of energy storage devices and other optoelectronic devices like solar cells and can replace the toxic lead halide perovskite cells.
Journal of Materials Science: Materials in Electronics
This study presents a comprehensive investigation of the structural, morphological, dielectric, m... more This study presents a comprehensive investigation of the structural, morphological, dielectric, magnetic, and magneto-dielectric properties of bilayered multiferroic Pb 0.95 R 0.05 Zr 0.52 Ti 0.48 O 3 /CoPr 0.1 Fe 1.9 O 4 , R = Pr, Yb (RPZT-CPrFO) thin films deposited on a Platinized Silicon Pt(111)/Si substrate at an elevated temperature of 600°C via the Pulsed Laser Deposition (PLD) technique. The X-ray diffraction (XRD) pattern confirms the oriented growth and single-phase nature of the as-prepared thin films on the Pt(111)/Si substrate. The average grain size and strain of the thin films are determined. Notably, the bilayer thin films exhibit a reduction in average grain size, with the YbPZT-CPrFO bilayer thin film displaying the smallest value (42.93 nm). The surface roughness is evaluated through the root mean square (RMS) roughness calculation, revealing an increase in surface roughness, with the YbPZT-CPrFO thin film exhibiting the highest value (11.41 9 10-3). Furthermore, all thin films demonstrate a characteristic magnetic hysteresis loop at room temperature, indicating the presence of long-range magnetic order. The in-plane M-H curves exhibit higher magnetization and remanence compared to the out-of-plane curves for all fabricated films indicating out-of-plane axis to be the hard axis for RPZT-CPrFO. The dielectric constant and dielectric loss of the thin films exhibit frequency-dependent variations ranging from 20 Hz to 2 MHz at ambient temperature with highest values for PrPZT-CPrFO with e r = 578.1312 and tan d = 0.09. The prepared thin films are found to have an enhanced energy storage efficiency (g), 60.6% for YbPZT-CPrFO and 63.07% for PrPZT-CPrFO indicating their use for energy storage devices. The highest magnetocapacitance (3.80%) is also observed in case of PrPZT-CPrFO thin films giving rise to enhanced multiferroic effect. The study indicates that Pr doping in both ferroelectric as well as ferromagnetic phase results in overall enhanced multiferroic properties.
In this paper, we analyze the effects of expansion on large-scale structure formation in our univ... more In this paper, we analyze the effects of expansion on large-scale structure formation in our universe. We do that by incorporating a cosmological constant term in the gravitational partition function. This gravitational partition function with a cosmological constant is used for analyzing the thermodynamics of this system. We analyze the virial expansion for this system, and obtain its equation of state. It is observed that the generalization of this equation of state is like the Van der Waals equation. We also analyze a gravitational phase transition in this system using the mean-field theory. We construct the cosmic energy equation for this system of galaxies, and discuss its consequences. We obtain and analyze the distribution function for this system, using the gravitational partition function. We also compare the results obtained in this paper with the observational data.
Comparative study of optical properties of substitutionally doped La2NiMnO6 double perovskite ceramic: A potential candidate for solar cells and dielectrics
Physica B: Condensed Matter, 2021
Abstract With the curiosity to account for transition metal-based oxide double perovskites (A2BB΄... more Abstract With the curiosity to account for transition metal-based oxide double perovskites (A2BB΄O6) as better-performing semiconducting materials for light-driven devices and dielectrics, the study examined the optical properties of La2NiMnO6 doped substitutionally at A sites by Ca and Yb. The study is performed by making use of Density Functional Theory wherein the Local Density Approximation along with columbic corrections (LDA + U) was used to investigate the comparative effect of Ca and Yb dopants at A site of LMNO and the changes observed henceforth are vital keeping in view the effect of change of charge state at A site. The dielectric tensor suggests the isotropic behaviour of the material. In case of applied varying ac fields, the dielectric constant becomes a complex quantity and has two parts viz real and imaginary wherein the real part is associated with the degree of polarization and the imaginary part, on the other hand, is associated with the dielectric losses. The dielectric constants (both real and imaginary) were plotted against the frequency changes and the trends in absorption, refraction, dielectrics, and optical conductivities that emerge from this study have important electronic and optical implications. The dielectric relaxation which arises as a consequence of the inability of the dipoles to cope with the frequent oscillations of the perturbing field makes it possible for the material to be used in memory elements. Furthermore, the simpler and cost-efficient method of preparation (Solid State Reaction) with the high value of dielectric constant and optical conductivities in the visible spectral range favors the use of these materials in the case of energy storage devices and other optoelectronic devices like solar cells and can replace the toxic lead halide perovskite cells.
Electronic and optical behaviour of anisotropic Nd2NiMnO6 double perovskite: A first principle study
Solid State Communications, 2021
Abstract Double perovskites are interesting in the field of material sciences because of their mu... more Abstract Double perovskites are interesting in the field of material sciences because of their multifunctional properties. Different researches have been done and several investigations have been carried out to explore these compounds. Here in this paper, we have explored one of the less investigated compounds i.e., Nd2NiMnO6. Although few experimental studies have been made and some results have been pointed out, still we are going to explore some properties of Nd2NiMnO6 using Density Functional Approach. Band structure and density of state (DOS) studies of the material in spin up and spin down channels disclose the semiconducting behavior of Nd2NiMnO6. The variation of dielectric constant with frequency and the variation of susceptibility with wavelength have also been presented with the explainable trends. The results also reveal the anisotropic nature in dielectric function and susceptibility of the compound.
Optimizing energy storage and magnetoelectric performance through core-shell engineering: A study on Ni0.5Co0.5Fe2O4-BaTiO3 multiferroic composite materials
Journal of magnetism and magnetic materials, Apr 1, 2024
Role of structural, morphological, and electronic characteristics in investigating the low temperature transport and magnetic behavior of Sr doped Sm2NiMnO6
International Journal of Modern Physics, May 30, 2022
In this paper, we analyze the effects of expansion on large scale structure formation in our Univ... more In this paper, we analyze the effects of expansion on large scale structure formation in our Universe. We do that by incorporating a cosmological constant term in the gravitational partition function. This gravitational partition function with a cosmological constant is used for analyzing the thermodynamics of this system. We analyze the virial expansion for this system, and obtain its equation of state. It is observed that the generalization of this equation of state is like the Van der Waals equation. We also analyze a gravitational phase transition in this system using the mean field theory. We construct the cosmic energy equation for this system of galaxies, and discuss its consequences. We obtain and analyze the distribution function for this system, using the gravitational partition function. We also compare the results obtained in this paper with the observational data.
Electronic and optical behaviour of anisotropic Nd2NiMnO6 double perovskite: A first principle study
Solid State Communications, Nov 1, 2021
Abstract Double perovskites are interesting in the field of material sciences because of their mu... more Abstract Double perovskites are interesting in the field of material sciences because of their multifunctional properties. Different researches have been done and several investigations have been carried out to explore these compounds. Here in this paper, we have explored one of the less investigated compounds i.e., Nd2NiMnO6. Although few experimental studies have been made and some results have been pointed out, still we are going to explore some properties of Nd2NiMnO6 using Density Functional Approach. Band structure and density of state (DOS) studies of the material in spin up and spin down channels disclose the semiconducting behavior of Nd2NiMnO6. The variation of dielectric constant with frequency and the variation of susceptibility with wavelength have also been presented with the explainable trends. The results also reveal the anisotropic nature in dielectric function and susceptibility of the compound.
Comparative study of optical properties of substitutionally doped La2NiMnO6 double perovskite ceramic: A potential candidate for solar cells and dielectrics
Physica B-condensed Matter, Nov 1, 2021
Abstract With the curiosity to account for transition metal-based oxide double perovskites (A2BB΄... more Abstract With the curiosity to account for transition metal-based oxide double perovskites (A2BB΄O6) as better-performing semiconducting materials for light-driven devices and dielectrics, the study examined the optical properties of La2NiMnO6 doped substitutionally at A sites by Ca and Yb. The study is performed by making use of Density Functional Theory wherein the Local Density Approximation along with columbic corrections (LDA + U) was used to investigate the comparative effect of Ca and Yb dopants at A site of LMNO and the changes observed henceforth are vital keeping in view the effect of change of charge state at A site. The dielectric tensor suggests the isotropic behaviour of the material. In case of applied varying ac fields, the dielectric constant becomes a complex quantity and has two parts viz real and imaginary wherein the real part is associated with the degree of polarization and the imaginary part, on the other hand, is associated with the dielectric losses. The dielectric constants (both real and imaginary) were plotted against the frequency changes and the trends in absorption, refraction, dielectrics, and optical conductivities that emerge from this study have important electronic and optical implications. The dielectric relaxation which arises as a consequence of the inability of the dipoles to cope with the frequent oscillations of the perturbing field makes it possible for the material to be used in memory elements. Furthermore, the simpler and cost-efficient method of preparation (Solid State Reaction) with the high value of dielectric constant and optical conductivities in the visible spectral range favors the use of these materials in the case of energy storage devices and other optoelectronic devices like solar cells and can replace the toxic lead halide perovskite cells.
Journal of Materials Science: Materials in Electronics
This study presents a comprehensive investigation of the structural, morphological, dielectric, m... more This study presents a comprehensive investigation of the structural, morphological, dielectric, magnetic, and magneto-dielectric properties of bilayered multiferroic Pb 0.95 R 0.05 Zr 0.52 Ti 0.48 O 3 /CoPr 0.1 Fe 1.9 O 4 , R = Pr, Yb (RPZT-CPrFO) thin films deposited on a Platinized Silicon Pt(111)/Si substrate at an elevated temperature of 600°C via the Pulsed Laser Deposition (PLD) technique. The X-ray diffraction (XRD) pattern confirms the oriented growth and single-phase nature of the as-prepared thin films on the Pt(111)/Si substrate. The average grain size and strain of the thin films are determined. Notably, the bilayer thin films exhibit a reduction in average grain size, with the YbPZT-CPrFO bilayer thin film displaying the smallest value (42.93 nm). The surface roughness is evaluated through the root mean square (RMS) roughness calculation, revealing an increase in surface roughness, with the YbPZT-CPrFO thin film exhibiting the highest value (11.41 9 10-3). Furthermore, all thin films demonstrate a characteristic magnetic hysteresis loop at room temperature, indicating the presence of long-range magnetic order. The in-plane M-H curves exhibit higher magnetization and remanence compared to the out-of-plane curves for all fabricated films indicating out-of-plane axis to be the hard axis for RPZT-CPrFO. The dielectric constant and dielectric loss of the thin films exhibit frequency-dependent variations ranging from 20 Hz to 2 MHz at ambient temperature with highest values for PrPZT-CPrFO with e r = 578.1312 and tan d = 0.09. The prepared thin films are found to have an enhanced energy storage efficiency (g), 60.6% for YbPZT-CPrFO and 63.07% for PrPZT-CPrFO indicating their use for energy storage devices. The highest magnetocapacitance (3.80%) is also observed in case of PrPZT-CPrFO thin films giving rise to enhanced multiferroic effect. The study indicates that Pr doping in both ferroelectric as well as ferromagnetic phase results in overall enhanced multiferroic properties.
In this paper, we analyze the effects of expansion on large-scale structure formation in our univ... more In this paper, we analyze the effects of expansion on large-scale structure formation in our universe. We do that by incorporating a cosmological constant term in the gravitational partition function. This gravitational partition function with a cosmological constant is used for analyzing the thermodynamics of this system. We analyze the virial expansion for this system, and obtain its equation of state. It is observed that the generalization of this equation of state is like the Van der Waals equation. We also analyze a gravitational phase transition in this system using the mean-field theory. We construct the cosmic energy equation for this system of galaxies, and discuss its consequences. We obtain and analyze the distribution function for this system, using the gravitational partition function. We also compare the results obtained in this paper with the observational data.
Comparative study of optical properties of substitutionally doped La2NiMnO6 double perovskite ceramic: A potential candidate for solar cells and dielectrics
Physica B: Condensed Matter, 2021
Abstract With the curiosity to account for transition metal-based oxide double perovskites (A2BB΄... more Abstract With the curiosity to account for transition metal-based oxide double perovskites (A2BB΄O6) as better-performing semiconducting materials for light-driven devices and dielectrics, the study examined the optical properties of La2NiMnO6 doped substitutionally at A sites by Ca and Yb. The study is performed by making use of Density Functional Theory wherein the Local Density Approximation along with columbic corrections (LDA + U) was used to investigate the comparative effect of Ca and Yb dopants at A site of LMNO and the changes observed henceforth are vital keeping in view the effect of change of charge state at A site. The dielectric tensor suggests the isotropic behaviour of the material. In case of applied varying ac fields, the dielectric constant becomes a complex quantity and has two parts viz real and imaginary wherein the real part is associated with the degree of polarization and the imaginary part, on the other hand, is associated with the dielectric losses. The dielectric constants (both real and imaginary) were plotted against the frequency changes and the trends in absorption, refraction, dielectrics, and optical conductivities that emerge from this study have important electronic and optical implications. The dielectric relaxation which arises as a consequence of the inability of the dipoles to cope with the frequent oscillations of the perturbing field makes it possible for the material to be used in memory elements. Furthermore, the simpler and cost-efficient method of preparation (Solid State Reaction) with the high value of dielectric constant and optical conductivities in the visible spectral range favors the use of these materials in the case of energy storage devices and other optoelectronic devices like solar cells and can replace the toxic lead halide perovskite cells.
Electronic and optical behaviour of anisotropic Nd2NiMnO6 double perovskite: A first principle study
Solid State Communications, 2021
Abstract Double perovskites are interesting in the field of material sciences because of their mu... more Abstract Double perovskites are interesting in the field of material sciences because of their multifunctional properties. Different researches have been done and several investigations have been carried out to explore these compounds. Here in this paper, we have explored one of the less investigated compounds i.e., Nd2NiMnO6. Although few experimental studies have been made and some results have been pointed out, still we are going to explore some properties of Nd2NiMnO6 using Density Functional Approach. Band structure and density of state (DOS) studies of the material in spin up and spin down channels disclose the semiconducting behavior of Nd2NiMnO6. The variation of dielectric constant with frequency and the variation of susceptibility with wavelength have also been presented with the explainable trends. The results also reveal the anisotropic nature in dielectric function and susceptibility of the compound.
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Papers by Shohaib Abass