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Title: Phase composition and magnetic properties of niobium-iron codoped TiO{sub 2} nanoparticles synthesized in Ar/O{sub 2} radio-frequency thermal plasma

Abstract

Nanoparticles of Nb{sup 5+}-Fe{sup 3+} codoped TiO{sub 2} with various Nb{sup 5+} concentrations (Nb/(Ti+Fe+Nb)=0-10.0 at%) and Fe{sup 3+} (Fe/(Ti+Fe+Nb)=0-2.0 at%) were synthesized using Ar/O{sub 2} thermal plasma. Dopant content, chemical valence, phase identification, morphology and magnetic properties were determined using several characterization techniques, including inductively coupled plasma-optical emission spectrometer, X-ray photoelectron spectroscopy, X-ray diffraction, UV-vis diffuse reflectance spectrometer, field-emission scanning electron microscopy, transmission electron microscopy and SQUID commercial instrument. The XRD revealed that all the plasma-synthesized powders were exclusively composed of anatase as major phase and rutile. The rutile weight fraction was increased by the substitution of Fe{sup 3+} for Ti{sup 4+} whereas it was reduced by the Nb{sup 5+} doping. The plasma-synthesized Nb{sup 5+}-Fe{sup 3+} codoped TiO{sub 2} powders had intrinsic magnetic properties of strongly paramagnetic and feebly ferromagnetic at room temperature. The ferromagnetic properties gradually deteriorated as the Fe{sup 3+} concentration was decreased, suggesting that the ferromagnetism was predominated by the phase composition as a carrier-mediated exchange. - Graphical Abstract: Spherical nanoparticles of Nb{sup 5+}-Fe{sup 3+} codoped TiO{sub 2} were synthesized using Ar/O{sub 2} thermal plasma. The plasma-synthesized powders were composed of anatase as major phase and rutile. Rutile weight fraction was increased by Fe{sup 3+} addition butmore » was reduced by Nb{sup 5+} doping. Strongly paramagnetic and feebly ferromagnetic properties are of intrinsic nature. Ferromagnetic properties gradually deteriorated as Fe{sup 3+} concentration was increased. Highlights: > Nanoparticles of Nb{sup 5+}-Fe{sup 3+} codoped TiO{sub 2} were synthesized using Ar/O{sub 2} thermal plasma. > The plasma-synthesized powders were composed of anatase as major phase and rutile. > Rutile weight fraction was increased by Fe{sup 3+} addition but was reduced by Nb{sup 5+} doping. > Strongly paramagnetic and feebly ferromagnetic properties are of intrinsic nature. > Ferromagnetic properties gradually deteriorated as Fe{sup 3+} concentration was increased.« less

Authors:
 [1];  [2];  [1];  [2];  [3]; ;  [1];  [4];  [5];  [2]
  1. Materials Processing Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047 (Japan)
  2. (Japan)
  3. Superconducting Properties Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044 (Japan)
  4. Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, 226-8502 (Japan)
  5. Department of Chemical Science and Technology, Hosei University, Koganei, Tokyo 184-8584 (Japan)
Publication Date:
OSTI Identifier:
21580248
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 184; Journal Issue: 9; Other Information: DOI: 10.1016/j.jssc.2011.07.025; PII: S0022-4596(11)00403-8; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; FIELD EMISSION; IRON IONS; MAGNETIC PROPERTIES; NANOSTRUCTURES; NIOBIUM; NIOBIUM IONS; PARAMAGNETISM; PARTICLES; PLASMA; RADIOWAVE RADIATION; RUTILE; SCANNING ELECTRON MICROSCOPY; SQUID DEVICES; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY; CHALCOGENIDES; CHARGED PARTICLES; COHERENT SCATTERING; DIFFRACTION; ELECTROMAGNETIC RADIATION; ELECTRON MICROSCOPY; ELECTRON SPECTROSCOPY; ELECTRONIC EQUIPMENT; ELEMENTS; EMISSION; EQUIPMENT; FLUXMETERS; IONS; MAGNETISM; MATERIALS; MEASURING INSTRUMENTS; METALS; MICROSCOPY; MICROWAVE EQUIPMENT; MINERALS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; PHOTOELECTRON SPECTROSCOPY; PHYSICAL PROPERTIES; RADIATIONS; RADIOACTIVE MATERIALS; RADIOACTIVE MINERALS; REFRACTORY METALS; SCATTERING; SPECTROSCOPY; SUPERCONDUCTING DEVICES; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS

Citation Formats

Zhang Chenning, Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, 226-8502, Ikeda, Masashi, Department of Materials Chemistry, Hosei University, Koganei, Tokyo 184-8584, Isobe, Masaaki, Uchikoshi, Tetsuo, Li, Ji-Guang, Watanabe, Takayuki, Ishigaki, Takamasa, E-mail: ishigaki@hosei.ac.jp, and Materials Processing Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047. Phase composition and magnetic properties of niobium-iron codoped TiO{sub 2} nanoparticles synthesized in Ar/O{sub 2} radio-frequency thermal plasma. United States: N. p., 2011. Web. doi:10.1016/j.jssc.2011.07.025.
Zhang Chenning, Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, 226-8502, Ikeda, Masashi, Department of Materials Chemistry, Hosei University, Koganei, Tokyo 184-8584, Isobe, Masaaki, Uchikoshi, Tetsuo, Li, Ji-Guang, Watanabe, Takayuki, Ishigaki, Takamasa, E-mail: ishigaki@hosei.ac.jp, & Materials Processing Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047. Phase composition and magnetic properties of niobium-iron codoped TiO{sub 2} nanoparticles synthesized in Ar/O{sub 2} radio-frequency thermal plasma. United States. doi:10.1016/j.jssc.2011.07.025.
Zhang Chenning, Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, 226-8502, Ikeda, Masashi, Department of Materials Chemistry, Hosei University, Koganei, Tokyo 184-8584, Isobe, Masaaki, Uchikoshi, Tetsuo, Li, Ji-Guang, Watanabe, Takayuki, Ishigaki, Takamasa, E-mail: ishigaki@hosei.ac.jp, and Materials Processing Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047. Thu . "Phase composition and magnetic properties of niobium-iron codoped TiO{sub 2} nanoparticles synthesized in Ar/O{sub 2} radio-frequency thermal plasma". United States. doi:10.1016/j.jssc.2011.07.025.
@article{osti_21580248,
title = {Phase composition and magnetic properties of niobium-iron codoped TiO{sub 2} nanoparticles synthesized in Ar/O{sub 2} radio-frequency thermal plasma},
author = {Zhang Chenning and Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, 226-8502 and Ikeda, Masashi and Department of Materials Chemistry, Hosei University, Koganei, Tokyo 184-8584 and Isobe, Masaaki and Uchikoshi, Tetsuo and Li, Ji-Guang and Watanabe, Takayuki and Ishigaki, Takamasa, E-mail: ishigaki@hosei.ac.jp and Materials Processing Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047},
abstractNote = {Nanoparticles of Nb{sup 5+}-Fe{sup 3+} codoped TiO{sub 2} with various Nb{sup 5+} concentrations (Nb/(Ti+Fe+Nb)=0-10.0 at%) and Fe{sup 3+} (Fe/(Ti+Fe+Nb)=0-2.0 at%) were synthesized using Ar/O{sub 2} thermal plasma. Dopant content, chemical valence, phase identification, morphology and magnetic properties were determined using several characterization techniques, including inductively coupled plasma-optical emission spectrometer, X-ray photoelectron spectroscopy, X-ray diffraction, UV-vis diffuse reflectance spectrometer, field-emission scanning electron microscopy, transmission electron microscopy and SQUID commercial instrument. The XRD revealed that all the plasma-synthesized powders were exclusively composed of anatase as major phase and rutile. The rutile weight fraction was increased by the substitution of Fe{sup 3+} for Ti{sup 4+} whereas it was reduced by the Nb{sup 5+} doping. The plasma-synthesized Nb{sup 5+}-Fe{sup 3+} codoped TiO{sub 2} powders had intrinsic magnetic properties of strongly paramagnetic and feebly ferromagnetic at room temperature. The ferromagnetic properties gradually deteriorated as the Fe{sup 3+} concentration was decreased, suggesting that the ferromagnetism was predominated by the phase composition as a carrier-mediated exchange. - Graphical Abstract: Spherical nanoparticles of Nb{sup 5+}-Fe{sup 3+} codoped TiO{sub 2} were synthesized using Ar/O{sub 2} thermal plasma. The plasma-synthesized powders were composed of anatase as major phase and rutile. Rutile weight fraction was increased by Fe{sup 3+} addition but was reduced by Nb{sup 5+} doping. Strongly paramagnetic and feebly ferromagnetic properties are of intrinsic nature. Ferromagnetic properties gradually deteriorated as Fe{sup 3+} concentration was increased. Highlights: > Nanoparticles of Nb{sup 5+}-Fe{sup 3+} codoped TiO{sub 2} were synthesized using Ar/O{sub 2} thermal plasma. > The plasma-synthesized powders were composed of anatase as major phase and rutile. > Rutile weight fraction was increased by Fe{sup 3+} addition but was reduced by Nb{sup 5+} doping. > Strongly paramagnetic and feebly ferromagnetic properties are of intrinsic nature. > Ferromagnetic properties gradually deteriorated as Fe{sup 3+} concentration was increased.},
doi = {10.1016/j.jssc.2011.07.025},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 9,
volume = 184,
place = {United States},
year = {2011},
month = {9}
}