Iron-doped SnO 2 diluted magnetic semiconducting powders (Sn 1-x Fe x O 2 , x=0.00, 0.03, 0.05, 0.07, 0.10, and 0.15) were synthesized by a simple solid state reaction followed by vacuum annealing and studied the effect of Fe dopant concentrations on structural, optical, and magnetic properties of the synthesized samples. From the X-ray diffraction, it was confirmed that the samples prepared at lower dopant concentrations were tetragonal in structure whereas the samples prepared at higher dopant concentration exhibited orthorhombic SnO and Fe 2 O 3 phases along with tetragonal SnO 2 structure. FT-IR spectrum has been used to confirm the formation of Sn-O bond. The optical band gap of the Sn 1-x Fe x O 2 powders was increased from 3.6 eV to 3.7 eV with increase of dopant concentration. Raman spectroscopy measurement revealed that the broadening of the most intense Raman peak observed at 630 cm -1 with Fe doping, conforming that the Fe ions are substituted at the Sn sites in the SnO 2 lattice. Vibrating sample magnetometer measurements confirmed that the Sn 1-x Fe x O 2 powders were ferromagnetic at room temperature. © 2013 Springer Science+Business Media New York.

Kuppan P

Department of Manufacturing Engineering

School of Mechanical Engineering

Vellore Campus

Shaik Kaleemulla

Department of Physics

School of Advanced Sciences

Madhusudhana Rao N

Sai Krishna N

Rigana Begam M

Sreekantha Reddy D.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Journal of Superconductivity and Novel Magnetism

Fe-substituted NiO nanoparticles (Ni1−xFexO2) (x= 0.00, 0.03, 0.05, 0.07, and 0.09) were synthesised using ball-milling method followed by vacuum sintering and studied for their microstructural and magnetic properties. All the samples show a cubic structure with a crystallite size of 17–26 nm. Secondary phases related to Fe2O3 were identified from XRD, indicating that the observed ferromagnetism may be due to the dopants. The doping of Fe ions does not cause any significant variation in the crystal structure. The pure NiO nanoparticles were weak ferromagnetic in nature, and Fe-doped NiO nanoparticles exhibit room temperature ferromagnetism. The strength of magnetization increased from 0.57 to 0.94 emu/g with an increase of Fe concentration from 3 to 7 at.%, respectively. A high coercive field of 173 Oe was observed for the Ni1−xFexO2 nanoparticles at x= 0.09. The results and the process of development of ferromagnetism at room temperature in the Ni1−xFexO2 nanoparticles were presented and discussed in detail. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Effect of Fe Substitution on Microstructure and Magnetic Properties of Ni1−xFexO2 Nanoparticles

The iron (Fe) and tin (Sn) co-doped indium oxide (In2O3) nanoparticles at different Fe doping concentrations were prepared by solid state reaction and studied for their structural, optical and magnetic properties. The XRD patterns confirmed the cubic structure of all the undoped and co-doped samples. The average crystallite size decreased on increasing from 41 to 32 nm by increase of Fe doping concentration from 5 to 15 at.%. The optical band gap of the samples was found to decrease from 2.89 to 2.77 eV by increasing the Fe dopant concentration. The magnetic properties of the nanoparticles were studied using vibrating sample magnetometer at room temperature and at 100 K by applying the field ±75,000 Oe perpendicular to the sample. The magnetization increased with increase of applied magnetic field and no saturation was observed in all the samples. The similar behavior was observed for the nanoparticles studied at 100 K. © 2017, Springer Science+Business Media, LLC.

Journal of Materials Science: Materials in Electronics

Synthesis and magnetic properties of (Fe, Sn) co-doped In2O3 nanoparticles

Iron doped tin oxide thin films (Sn1−xFexO2) at x = 0.00, 0.03, 0.05, 0.07,0.10 and 0.15 were prepared onto Corning 7059 substrates using flash evaporation technique and studied the effect of iron (Fe) doping concentration on structural, optical and magnetic properties of the prepared thin films. From the X-ray diffraction patterns, it was found that the Sn1−xFexO2 thin films were polycrystalline with tetragonal structure. The crystallite sizes of the films were calculated using Scherrer’s relation and found that it was about 25 nm. The chemical composition and oxidation states of the elements were found using energy dispersive analysis of X-rays and X-ray photoelectron spectroscopy. From this it was confirmed that the Fe was substituted Sn sites and is in Fe+3states. The optical band gap of the films decreased from 3.98 to 3.76 eV with increase of Fe doping concentration. The pure SnO2 thin films exhibited diamagnetism whereas Sn1−xFexO2 thin films exhibited ferromagnetism at room temperature. A magnetic (Ms), coercivity (Hci) and retentivity (Mr) were found to be 13.062 emu/cm3, 114.98 G, 7.487 × 10−6 emu/cm3, respectively Sn1−xFexO2 thin films at x = 0.07. © 2016, Springer Science+Business Media New York.

Structural, optical and room temperature ferromagnetic properties of Sn1−xFexO2 thin films using flash evaporation technique

Indium-tin-oxide (ITO) (In0.95Sn0.05)2O3 and Cr doped indium-tin-oxide (In0.90Sn0.05Cr0.05)2O3 nanoparticles were prepared using simple low cost solid state reaction method and characterized by different techniques to study their structural, optical and magnetic properties. Microstructures, surface morphology, crystallite size of the nanoparticles were studied using X-ray diffractometer (XRD), field emission scanning electron microscope (FE-SEM). From these methods it was found that the particles were about 45 nm. Chemical composition and valence states of the nanoparticles were studied using energy dispersive analysis of X-rays (EDAX) and X-ray photoelectron spectroscopy (XPS). From these techniques it was observed that the elements of indium, tin, chromium and oxygen were present in the system in appropriate ratios and they were in +3, +4, +3 and −2 oxidation states. Raman studies confirmed that the nanoparticle were free from unintentional impurities. Two broad emission peaks were observed at 330 nm and 460 nm when excited wavelength of 300 nm. Magnetic studies were carried out at 300 K and 100 K using vibrating sample magnetometer (VSM) and found that the ITO nanoparticles were ferromagnetic at 100 K and 300 K. Where-as the room temperature ferromagnetism completely disappeared in Cr doped ITO nanoparticles at 100 K and 300 K. © 2016 Elsevier B.V.

Physica B: Condensed Matter

Microstructure, ferromagnetic and photoluminescence properties of ITO and Cr doped ITO nanoparticles using solid state reaction

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. © 2016 Author(s).

AIP Conference Proceedings

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

Journal of Magnetism and Magnetic Materials

Structure and magnetic properties of Sn1−xMnxO2

Thin Solid Films

Room temperature ferromagnetism in Ni doped In2O3 nanoparticles

Nanomaterials and Nanotechnology

Magnetic Properties of Fe and Ni Doped SnO2 Nanoparticles

Single phase Sn1-xFexO2 (x = 0.1, 0.3 and 0.5) nanoparticles having size in the range 9-17 nm were prepared by a chemical route. XRD analysis of the samples confirmed the formation of cassiterite phase without any impurity. The nanocrystalline nature of the samples and their crystallinity were confirmed by TEM measurements. Raman and Mössbauer spectroscopy studies indicate structural disorder and vacancies in the nanostructures. M-H and M-T data recorded by a SQUID magnetometer show that the samples are essentially paramagnetic with a weak ferromagnetic component. Ferromagnetism is argued to be associated with the vacancies and defects present in the grain boundaries and interfaces of the nanoparticles. © 2010 Elsevier B.V. All rights reserved.

Journal	Data powered by TypesetJournal of Superconductivity and Novel Magnetism
Publisher	Data powered by TypesetSpringer Science and Business Media LLC
ISSN	1557-1939
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