Aditya Sharma - Academia.edu (original) (raw)
Papers by Aditya Sharma
Physica Scripta, 2012
In this work, we report detailed investigations on the structural and magnetic properties of pure... more In this work, we report detailed investigations on the structural and magnetic properties of pure and Co-doped CeO 2 nanoparticles. All the samples, with different cobalt concentrations, were prepared by the co-precipitation method. To investigate the structural properties and phases present in the samples, systematic, x-ray diffraction measurements were performed in the θ-2θ mode. Phonon modes, from the pure and Co-doped samples, were studied by Raman scattering measurements. Surface morphology of individual nanoparticles was studied by field emission scanning electron microscopy. Interestingly, room temperature ferromagnetism is observed in, both, un-doped and Co-doped samples. The mechanisms of variation in the Raman active mode (F 2g ) and magnetization, by increasing the cobalt concentration, are briefly discussed.
Journal of Applied Physics, 2010
We present a detailed study on the structural, electronic, and magnetic properties of chemically ... more We present a detailed study on the structural, electronic, and magnetic properties of chemically synthesized Sn1-xCoxO2 (x=0.00 to 0.05) nanoparticles. X-ray diffraction and transmission electron microscope measurements were performed to analyze the crystal structure and morphology of Sn1-xCoxO2 nanoparticles. The energy dispersive x-ray analysis measurements were performed to check the possible presence of any impurity elements in the nanocrystals. The near edge x-ray absorption fine structure (NEXAFS) experiments at Sn M5,4-edge and Co L3,2-edge were performed to probe the local environment of Sn and Co ions in the SnO2 matrix. The NEXAFS at Co L3,2-edge, along with multiplet calculations, indicate that the Co is substituted at the Sn site in SnO2 matrix with +2 charge state and do not form metallic clusters and other oxide phases. The ferromagnetic nature of these materials was confirmed by x-ray magnetic circular dichroism and room temperature magnetization hysteresis loop measurements.
Burns, 1998
An analysis of autopsy records of burn victims revealed that most burn deaths occurred in the age... more An analysis of autopsy records of burn victims revealed that most burn deaths occurred in the age group 21-40 years (67 per cent) with female preponderance (61 per cent) in all age groups except in the extreme age groups. 62 per cent of burn cases originated in urban areas. The majority of subjects (99 per cent females and 76 per cent males) died as a result of flame burns. Kerosene was the most common factor (76 per cent) in burn deaths. 11 per cent of deaths were due to the stove bursting and 27 per cent of victims died due to leakage of oil from the stove. 39 per cent of subjects sustained burns when their cIothes caught fire. Scalds (3.3 per cent), electrical (4.7 per cent) and chemical (2.3 per cent) burns were more commonly seen in males. mainly sustained at their working place. Accidental burns were observed in 80 per cent of subjects followed by suicidal (16.2 per cent) and homicidal burn assaults (4.1 per cent). Peak incidence of burns in females was observed between 5.01 a.m. and 11 a.m. (38 per cent), which was the time of least incidence in males (10.3 per cent). The opposite trend was seen between 11.01 p.m. and 5 a.m. Among males, burn deaths were more common (85 per cent) in those who were living alone, away from their families; whereas in women the incidence of burn deaths was higher (74 per cent) in those living with their families. The majority of deaths due to burns occurred within one week (77 per cent) of the incident. Septicaemia was the major cause of death (55 per cent). 0
We report on the element-specific magnetic characterization of Ni nanoparticles (NPs) embedded in... more We report on the element-specific magnetic characterization of Ni nanoparticles (NPs) embedded in Al 2 O 3 (0 0 1) matrix prepared by ion-implantation (Ni:5 Â 10 16 -2 Â 10 17 ions cm À2 ) technique. The X-ray diffraction studies reveal the coexistence of fcc Ni NPs of average size $8-19 nm along with the other NiO x phases. X-ray magnetic circular dichroism (XMCD) experiments demonstrate the competing nature of magnetic interactions between the Ni NPs and NiO x phases. The ferromagnetism at 10 K (for all the Ni implants) is related to the combined contribution of both phases, while the room temperature superparamagnetism at higher fluence is dominated by Ni NPs phase as confirmed by Ni L 3,2 XMCD measurements.
Chemical Physics Letters, 2011
We report on the element-specific magnetic characterization of Ni nanoparticles (NPs) embedded in... more We report on the element-specific magnetic characterization of Ni nanoparticles (NPs) embedded in Al 2O 3 (0 0 1) matrix prepared by ion-implantation (Ni:5 × 10 16-2 × 10 17 ions cm -2) technique. The X-ray diffraction studies reveal the coexistence of fcc Ni NPs of average size ˜8-19 nm along with the other NiO x phases. X-ray magnetic circular dichroism (XMCD) experiments demonstrate the competing nature of magnetic interactions between the Ni NPs and NiO x phases. The ferromagnetism at 10 K (for all the Ni implants) is related to the combined contribution of both phases, while the room temperature superparamagnetism at higher fluence is dominated by Ni NPs phase as confirmed by Ni L 3,2 XMCD measurements.
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2011
Author(s) of this paper may load this reprint on their own web site or institutional repository p... more Author(s) of this paper may load this reprint on their own web site or institutional repository provided that this cover page is retained. Republication of this article or its storage in electronic databases other than as specified above is not permitted without prior permission in writing from the IUCr.
Radiation Effects and Defects in Solids, 2010
In this paper, we present the impact of swift heavy ion beam irradiation on the structural, optic... more In this paper, we present the impact of swift heavy ion beam irradiation on the structural, optical and electronic properties of SnO2 thin films. Thin films were deposited using the pulsed laser deposition technique on Al2O3 substrates. Atomic force microscopy, X-ray diffraction, UV–visible absorption and temperature-dependent resistivity measurements were performed to explore the morphological, structural, optical and electronic properties of the as-deposited and irradiated samples. The peak intensity of the (200) peak was found to decrease monotonously with increasing irradiation fluence. The band gap energy of the 1×1011 ion/cm2 irradiated sample was found to increase. The electrical resistivity of the samples showed a continuous increase with the irradiation fluence.
Power utilities are increasingly rolling out smart grids with the ability to track consumer pow... more Power utilities are increasingly rolling out smart grids with the ability to track consumer power usage in near real-time using smart meters that enable bi-directional communication. However, the true value of smart grids is unlocked only when the veritable explosion of ...
Physica Scripta, 2012
In this work, we report detailed investigations on the structural and magnetic properties of pure... more In this work, we report detailed investigations on the structural and magnetic properties of pure and Co-doped CeO 2 nanoparticles. All the samples, with different cobalt concentrations, were prepared by the co-precipitation method. To investigate the structural properties and phases present in the samples, systematic, x-ray diffraction measurements were performed in the θ-2θ mode. Phonon modes, from the pure and Co-doped samples, were studied by Raman scattering measurements. Surface morphology of individual nanoparticles was studied by field emission scanning electron microscopy. Interestingly, room temperature ferromagnetism is observed in, both, un-doped and Co-doped samples. The mechanisms of variation in the Raman active mode (F 2g ) and magnetization, by increasing the cobalt concentration, are briefly discussed.
Journal of Applied Physics, 2010
We present a detailed study on the structural, electronic, and magnetic properties of chemically ... more We present a detailed study on the structural, electronic, and magnetic properties of chemically synthesized Sn1-xCoxO2 (x=0.00 to 0.05) nanoparticles. X-ray diffraction and transmission electron microscope measurements were performed to analyze the crystal structure and morphology of Sn1-xCoxO2 nanoparticles. The energy dispersive x-ray analysis measurements were performed to check the possible presence of any impurity elements in the nanocrystals. The near edge x-ray absorption fine structure (NEXAFS) experiments at Sn M5,4-edge and Co L3,2-edge were performed to probe the local environment of Sn and Co ions in the SnO2 matrix. The NEXAFS at Co L3,2-edge, along with multiplet calculations, indicate that the Co is substituted at the Sn site in SnO2 matrix with +2 charge state and do not form metallic clusters and other oxide phases. The ferromagnetic nature of these materials was confirmed by x-ray magnetic circular dichroism and room temperature magnetization hysteresis loop measurements.
Burns, 1998
An analysis of autopsy records of burn victims revealed that most burn deaths occurred in the age... more An analysis of autopsy records of burn victims revealed that most burn deaths occurred in the age group 21-40 years (67 per cent) with female preponderance (61 per cent) in all age groups except in the extreme age groups. 62 per cent of burn cases originated in urban areas. The majority of subjects (99 per cent females and 76 per cent males) died as a result of flame burns. Kerosene was the most common factor (76 per cent) in burn deaths. 11 per cent of deaths were due to the stove bursting and 27 per cent of victims died due to leakage of oil from the stove. 39 per cent of subjects sustained burns when their cIothes caught fire. Scalds (3.3 per cent), electrical (4.7 per cent) and chemical (2.3 per cent) burns were more commonly seen in males. mainly sustained at their working place. Accidental burns were observed in 80 per cent of subjects followed by suicidal (16.2 per cent) and homicidal burn assaults (4.1 per cent). Peak incidence of burns in females was observed between 5.01 a.m. and 11 a.m. (38 per cent), which was the time of least incidence in males (10.3 per cent). The opposite trend was seen between 11.01 p.m. and 5 a.m. Among males, burn deaths were more common (85 per cent) in those who were living alone, away from their families; whereas in women the incidence of burn deaths was higher (74 per cent) in those living with their families. The majority of deaths due to burns occurred within one week (77 per cent) of the incident. Septicaemia was the major cause of death (55 per cent). 0
We report on the element-specific magnetic characterization of Ni nanoparticles (NPs) embedded in... more We report on the element-specific magnetic characterization of Ni nanoparticles (NPs) embedded in Al 2 O 3 (0 0 1) matrix prepared by ion-implantation (Ni:5 Â 10 16 -2 Â 10 17 ions cm À2 ) technique. The X-ray diffraction studies reveal the coexistence of fcc Ni NPs of average size $8-19 nm along with the other NiO x phases. X-ray magnetic circular dichroism (XMCD) experiments demonstrate the competing nature of magnetic interactions between the Ni NPs and NiO x phases. The ferromagnetism at 10 K (for all the Ni implants) is related to the combined contribution of both phases, while the room temperature superparamagnetism at higher fluence is dominated by Ni NPs phase as confirmed by Ni L 3,2 XMCD measurements.
Chemical Physics Letters, 2011
We report on the element-specific magnetic characterization of Ni nanoparticles (NPs) embedded in... more We report on the element-specific magnetic characterization of Ni nanoparticles (NPs) embedded in Al 2O 3 (0 0 1) matrix prepared by ion-implantation (Ni:5 × 10 16-2 × 10 17 ions cm -2) technique. The X-ray diffraction studies reveal the coexistence of fcc Ni NPs of average size ˜8-19 nm along with the other NiO x phases. X-ray magnetic circular dichroism (XMCD) experiments demonstrate the competing nature of magnetic interactions between the Ni NPs and NiO x phases. The ferromagnetism at 10 K (for all the Ni implants) is related to the combined contribution of both phases, while the room temperature superparamagnetism at higher fluence is dominated by Ni NPs phase as confirmed by Ni L 3,2 XMCD measurements.
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2011
Author(s) of this paper may load this reprint on their own web site or institutional repository p... more Author(s) of this paper may load this reprint on their own web site or institutional repository provided that this cover page is retained. Republication of this article or its storage in electronic databases other than as specified above is not permitted without prior permission in writing from the IUCr.
Radiation Effects and Defects in Solids, 2010
In this paper, we present the impact of swift heavy ion beam irradiation on the structural, optic... more In this paper, we present the impact of swift heavy ion beam irradiation on the structural, optical and electronic properties of SnO2 thin films. Thin films were deposited using the pulsed laser deposition technique on Al2O3 substrates. Atomic force microscopy, X-ray diffraction, UV–visible absorption and temperature-dependent resistivity measurements were performed to explore the morphological, structural, optical and electronic properties of the as-deposited and irradiated samples. The peak intensity of the (200) peak was found to decrease monotonously with increasing irradiation fluence. The band gap energy of the 1×1011 ion/cm2 irradiated sample was found to increase. The electrical resistivity of the samples showed a continuous increase with the irradiation fluence.
Power utilities are increasingly rolling out smart grids with the ability to track consumer pow... more Power utilities are increasingly rolling out smart grids with the ability to track consumer power usage in near real-time using smart meters that enable bi-directional communication. However, the true value of smart grids is unlocked only when the veritable explosion of ...