N. Sai Krishna

Structural and Magnetic Properties of Ni Doped

Nickel (Ni) doped SnO2 powder samples were prepared using solid-state reaction with dopant concentrations in the range of 3 at.% to 15 at.%. The influence of Ni doping on structural, optical, and magnetic properties of the powder samples has been investigated. All the Ni doped powder samples exhibited tetragonal structure of SnO2. A decrease in optical band gap was observed with increase of Ni doping levels. The vibrating sample magnetometer measurements revealed that the Ni doped SnO2 powder samples were ferromagnetic at room temperature.

Structural, Optical, and Magnetic Properties of Co Doped CdTe Alloy Powders Prepared by Solid-State Reaction Method

Co doped CdTe powder samples were prepared by solid-state reaction method. In the present work effect of Co doping on structural, optical, and magnetic properties has been studied. X-ray diffraction studies confirm zinc blend structure for all the samples. The lattice parameter showed linear increase with the increase in Co content. The elemental constituents were characterized by EDAX. Optical studies showed the increase in band gap with increase in Co level. The samples were diluted magnetic semiconductors and exhibited clear hysteresis loop showing room temperature ferromagnetism as confirmed by vibrating sample magnetometer.

Synthesis and characterizations of (In0.90Sn0.05Ni0.05)2O3 nanoparticles using solid state reaction method

ITO (In0.95Sn0.05)2O3 and Ni doped ITO (In0.90Sn0.05Ni0.05)2O3 nanoparticles (NPs) were synthesized by solid state reaction method and subjected to study their structural, optical and magnetic properties. The NPs had a size distribution in the range of 40 nm and were identified as the bcc cubic In2O3 by X-ray diffraction (XRD). Optical properties of the samples were studies using UV-Vis-NIR spectrophotometer. Magnetic measurements were carried out at room temperature and at 100 K using vibrating sample magnetometer and found that the ITO nanoparticles were ferromagnetic in nature at room temperature. The strength of the magnetization decreased in ITO nanoparticles when the magnetic measurements carried out at 100 K.

Structural, optical and magnetic properties of (In0.90Sn0.05Cu0.05)2O3 nanoparticles

This study examined structural, optical and magnetic properties of ITO (In0.95Sn0.05)2O3 and Cu doped ITO (In0.90Sn0.05Cu0.05)2O3 nanoparticles synthesized by solid state reaction method. The synthesized nanoparticles were subjected to structural, optical and magnetic studies. The structural properties of the nanoparticles were carried out using XRD, Raman, FT-IR characterization techniques. Optical properties of the samples were studies using UV-Vis-NIR spectrophotometer. The magnetic measurements were carried out using vibrating sample magnetometer. The ITO (In0.95Sn0.05)2O3 nanoparticles exhibited room temperature ferromagnetism with clear hysteresis loop. The strength of magnetization decreased in Cu doped ITO (In0.90Sn0.05Cu0.05)2O3. The ITO nanoparticles were also exhibited ferromagnetism at 100 K with a magnetic moment of 0.02 emu/g.

Raman and FT-IR studies of (In0.90Sn0.05Fe0.05)2O3 nanoparticles

ITO (In0.95Sn0.05)2O3 and Fe doped ITO (In0.90Sn0.05Fe0.05)2O3 nanoparticles were synthesized using standard solid state reaction and characterized by XRD, Raman and FT-IR studies, UV-Vis-NIR spectrophotometer and vibrating sample magnetometer for structural, optical and magnetic properties.The XRD patterns revealed the formation of nanocrystalline particles with cubic bixbyte crystal structure. The Raman spectra show that the nanoparticles are free of secondary crystalline phase.From FT-IR studies it was found that the bonds observed were due to In2O3 and no new peaks were found in FT-IR spectra. This clearly indicatesthat Fe ions are incorporate into the host In2O3 structure and does not alter the crystal structure of In2O3 host material. The undoped ITO nanoparticles exhibited room temperature ferromagnetism with clear hysteresis curve having coercive field of 683 G whereas the same ITO nanoparticles exhibited coercive field of 150 G at 100 K.

Room temperature ferromagnetism in undoped and Ni doped In2O3 thin films

Undoped and Ni (5 at.%) doped In2O3 thin films were deposited on glass substrate using electron beam evaporation technique and Ni doped In2O3 thin films were annealed at 450 oC. A systematic study was carried out on the structural, chemical and magnetic properties of the as deposited and annealed thin films. X-ray diffraction analysis revealed that all the films were cubic in structure and exhibied ferromagnetism at room temperature. The undoped In2O3 thin films exhibited a saturation magnetization of 24.01 emu/cm3. Ni doped In2O3 thin films annealed at 450 oC showed a saturation magnetization of 53.81 emu/cm3.

Structure and magnetic properties of Fe doped In2O3 thin films prepared by electron beam evaporation

Pure and Fe (7 at.%) doped In2O3 thin films were grown onto the glass substrates by electron beam evaporation technique. The structural and magnetic properties of the pure and Fe doped In2O3 thin films have been studied. The undoped and Fe doped In2O3 thin films shown ferromagnetic property at room temperature. A magnetization of 24 emu/cm3 was observed for pure In2O3 thin films. The magnetization of 38.23 emu/cm3 was observed for the Fe (7 at.%) doped In2O3 thin films.

Structural and magnetic properties of pure and Cu doped In2O3 thin films

Pure and Cu (7 at.%) doped In2O3 thin films were prepared using an electron beam evaporation technique. A systematic study was carried out on the structural, chemical and magnetic properties of the thin films. X-ray diffraction analysis revealed that all the films were cubic in structure. The pure and Cu doped In2O3 thin films showed ferromagnetism at room temperature. The Cu doped In2O3 thin films showed the saturation magnetization, coercivity and retentivity of 38.71 emu/cm3, 245 G and 5.54 emu/cm3, respectively.

Structural and optical properties of Sn1−xFexO2 thin films prepared by flash evaporation technique

Sn1−xFeXO2 (x = 0, 0.05) thin films were prepared on glass substrate using the flash evaporation technique. The samples were annealed at 773 K for 2 hrs in air atmosphere. A systematic study was carried out on the structural and optical properties of the as deposited and annealed thin films. From the X-ray diffraction analysis it was found that the Sn1−xFeXO2 films deposited at 623 K were amorphous in nature and the Sn1−xFeXO2 films annealed at 773 K exhibited the tetragonal structure of the SnO2. The optical band gap of the SnO2 thin films was found to be as 3.17 eV whereas the optical band gap of the Sn1−xFeXO2 films was found to be as 3.01 eV after air annealing.