Crystal and defect structures of La2/3-xLi3xTiO 3 (x ∼ 0.1) produced by a melt process

Kyosuke Kishida, Mai Miyata, Naoyuki Wada, Norihiko L. Okamoto, Katsushi Tanaka, Haruyuki Inui, Hiroshi Koyama, Takeshi Hattori, Yasutoshi Iriyama, Zempachi Ogumi

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10 Citations (Scopus)

Abstract

The crystal and defect structures of coarse-grained crystals of La 2/3-xLi3xTiO3 grown from the melt by the Tammann-Stöber method were studied by transmission electron microscopy and powder X-ray diffraction. The as-grown crystals of La2/3-xLi 3xTiO3 have a Li-poor composition of La 0.57Li0.29TiO3 and a diagonal-type unit cell of 21/2ap × 21/2ap × 2ap with the tetragonal symmetry [space group: P4/nbm (#125)] due to both the La-cation ordering and the tilting of TiO6 octahedra. The secondary La2Ti2O7 phase precipitates in the form of plates in the La2/3-xLi3xTiO3 phase with the orientation relationships of {001}p//[100] La2Ti2O7 and {110}p//(001)La2Ti2O7, which may cause detrimental effects to ionic conductivity.

Original languageEnglish
Pages (from-to)225-234
Number of pages10
JournalJournal of Electron Microscopy
Volume56
Issue number6
DOIs
Publication statusPublished - 2007 Dec
Externally publishedYes

Keywords

  • Crystal structure
  • Perovskites
  • Precipitates
  • Solid electrolytes
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Instrumentation

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