論文

査読有り
2013年4月

Intrinsic and impurity defects in chromium-doped SrTiO3 nanopowders: EPR and NMR study

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
  • Igor Bykov
  • ,
  • Marina Makarova
  • ,
  • Vladimir Trepakov
  • ,
  • Alexandr Dejneka
  • ,
  • Lesya Yurchenko
  • ,
  • Ales Jaeger
  • ,
  • Lubomir Jastrabik

250
4
開始ページ
821
終了ページ
824
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1002/pssb.201200871
出版者・発行元
WILEY-V C H VERLAG GMBH

Electron Paramagnetic Resonance (EPR) and Nuclear Magnetic Resonance (NMR) spectra were studied in solvothermal- and citrate sol-gel-grown (CSGG) SrTiO3:Cr(0.1%) crystalline nanopowders. Various growth conditions and thermal treatments were used to determine defects and to tailor nanoparticles structure and crystallization processes. Solvothermal-grown nanopowders with 5 nm particle size revealed the dominant presence of the single perovskite-type phase. Annealing of the CSGG nanoparticles in air up to 800 degrees C leads to an increase of the particles size and the amount of the titaniumdioxide (rutile and/or anatase) phase, which is initially present in small amounts in CSGG powders. It was found that paramagnetic Cr3+, Cr5+, Cr3+ surf, O-, O2- ions are present in solvothermal- grown nanopowders and in all CSGG powders. In the annealed particles the majority of paramagnetic centers (PC) are located in the particle surface and in the TiO2 phase. The nature of the PC in nanopowders exhibiting different degrees of catalytic activity in nanopowders was studied too. A correlation between O- and O2- content, synthesis conditions and particle size was found. The NMR spectra of Ti-47 (I = 5/2) and Ti-49 (I = 7/2) reveal a pronounced dependence of the spectral line intensity on synthesis conditions, evidencing coexistence of Ti3+ and Ti4+ ions in SrTiO3:Cr nanoparticles. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Web of Science ® 被引用回数 : 10

リンク情報
DOI
https://doi.org/10.1002/pssb.201200871
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000318791900030&DestApp=WOS_CPL

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