Iron doped indium oxide dilute magnetic semiconductor (In1-xFex)2O3 (x = 0.00, 0.03, 0.05, and 0.07) powders were synthesized by standard solid state reaction method followed by vacuum annealing. The effect of Fe concentration on structural, optical, and magnetic properties of the (In1-xFex)2O3 powders have been systematically studied. X-ray diffraction patterns confirmed the polycrystalline cubic structure of all the samples. An optical band gap increases from 3.12 eV to 3.16 eV while Fe concentration varying from 0.03 to 0.07. Magnetic studies reveal that virgin/undoped In2O3 is diamagnetic. However, all the Fe-doped In2O3 samples are ferromagnetic. The saturation magnetization (Ms) of ferromagnetic (In1-xFex)2O3 (x = 0.03, 0.05, and 0.07) samples increases from 11.56 memu/g to 148.64 memu/g with x = 0.03-0.07. The observed ferromagnetism in these samples was attributed to magnetic nature of the dopant (Fe) as well as defects created in the samples during vacuum annealing. © 2014 Elsevier Ltd. All rights reserved.

Shaik Kaleemulla

Department of Physics

School of Advanced Sciences

Vellore Campus

Krishnamoorthi C

Kuppan P

Department of Manufacturing Engineering

School of Mechanical Engineering

Krishna N.S

Madhusudhana Rao N

Sivasankar J

Mallikarjuna P

Amarendra G

Rao N.M

Rigana Begam M

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.

&nbsp;

&nbsp;

VIT University

Materials Research Bulletin

Journal of Electronic Materials

Evidence of Room Temperature Ferromagnetism Due to Oxygen Vacancies in (In1−xFex)2O3 Thin Films

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

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

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. © 2016 Author(s).

Fulltext

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

Synthesis, magnetic and dielectric characterization of nanocrystalline solid solutions of In2−xNixO3 (x=0.05, 0.10 and 0.15)

Journal of the American Ceramic Society

Solvothermal Synthesis of In2−xCoxO3(0.05 ≤ x ≤ 0.15) Dilute Magnetic Semiconductors: Optical, Magnetic, and Dielectric Properties

Thin Solid Films

Ferromagnetism in Cr doped In2O3

Nanoscale

Room temperature ferromagnetism in epitaxial In2O3 films with embedded nano-sized Fe3O4 columns

Journal of Alloys and Compounds

Optical and magnetic properties of solid solutions of In2−xMnxO3 (0.05, 0.10 and 0.15) nanoparticles

Structural, optical, and magnetic properties of Fe doped In2O3 powders

Journal	Data powered by TypesetMaterials Research Bulletin
Publisher	Data powered by TypesetElsevier BV
ISSN	0025-5408
Open Access	No