論文

2009年9月

SrTiO3: Cr nanocrystalline powders: size effects and optical properties

JOURNAL OF PHYSICS-CONDENSED MATTER
  • V. A. Trepakov
  • ,
  • Z. Potucek
  • ,
  • M. V. Makarova
  • ,
  • A. Dejneka
  • ,
  • P. Sazama
  • ,
  • L. Jastrabik
  • ,
  • Z. Bryknar

21
37
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1088/0953-8984/21/37/375303
出版者・発行元
IOP PUBLISHING LTD

The crystal structure, optical absorption, and photoluminescence of chromium impurity centers were studied in nanocrystalline SrTiO3: Cr (0.1 mol%) powders with average particle size within the range 13-100 nm prepared by the Pechini-type polymeric sol-gel method. Only the presence of a cubic perovskite phase of O-h(1) symmetry was proved for the powders at room temperature, by means of x-ray diffraction. The lattice constant a = 3.910 angstrom, larger than that of bulk SrTiO3 crystals (a = 3.905 angstrom), was found for nanoparticles with the size about 20 nm. The optical absorption edge and the zero-phonon R-line (E-2 -> (4)A(2)) of luminescence of the octahedral Cr3+ centers shifted to higher energies with decreasing nanoparticle size. These size effects were regarded as intrinsic to SrTiO3. An unusual and large temperature shift of the R-line position very similar to the 'dielectric related' one of the bulk crystals was observed for all powders, evidencing their quantum paraelectric behavior. However, the powders with the average particle size about 13 and 20 nm did not reveal completely reproducible behavior of the R-line position at low temperatures. This instability was considered a possible manifestation of a low-temperature phase transition in small enough SrTiO3 nanoparticles.

Web of Science ® 被引用回数 : 11

リンク情報
DOI
https://doi.org/10.1088/0953-8984/21/37/375303
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000269198900016&DestApp=WOS_CPL
URL
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=70349573028&origin=inward

エクスポート
BibTeX RIS