Phase composition and magnetic properties of niobiumiron codoped TiO 2 nanoparticles synthesized in Ar/O2 radio-frequency thermal plasma

Chenning Zhang, Masashi Ikeda, Masaaki Isobe, Tetsuo Uchikoshi, Ji Guang Li, Takayuki Watanabe, Takamasa Ishigaki

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Abstract

Nanoparticles of Nb5Fe3 codoped TiO2 with various Nb5 concentrations (Nb/(TiFeNb)=010.0 at%) and Fe3 (Fe/(TiFeNb)=02.0 at%) were synthesized using Ar/O2 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, UVvis 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 Fe3 for Ti4 whereas it was reduced by the Nb5 doping. The plasma-synthesized Nb5Fe3 codoped TiO 2 powders had intrinsic magnetic properties of strongly paramagnetic and feebly ferromagnetic at room temperature. The ferromagnetic properties gradually deteriorated as the Fe3 concentration was decreased, suggesting that the ferromagnetism was predominated by the phase composition as a carrier-mediated exchange.

Original languageEnglish
Pages (from-to)2525-2532
Number of pages8
JournalJournal of Solid State Chemistry
Volume184
Issue number9
DOIs
Publication statusPublished - Sep 1 2011
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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