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Journal of Electron Microscopy Advance Access originally published online on November 26, 2007
Journal of Electron Microscopy 2007 56(6):225-234; doi:10.1093/jmicro/dfm031
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Crystal and Defect Structures of La2/3–xLi3xTiO3 (x ~ 0.1) Produced by a Melt Process

Kyosuke Kishida1,*, Mai Miyata1, Naoyuki Wada1, Norihiko L. Okamoto1, Katsushi Tanaka1, Haruyuki Inui1, Hiroshi Koyama2, Takeshi Hattori3, Yasutoshi Iriyama4 and Zempachi Ogumi4

1 Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501
2 Institute for Multidisciplinary Research of Advanced Materials, Tohoku University, Katahira 2-1-1, Aobaku, Sendai 980-8577
3 Department of Applied Physics, Faculty of Science, Tokyo University of Science, Kagurazaka 1-3, Shinjuku, Tokyo 162-8601 and
4 Department of Energy and Hydrocarbon Chemistry, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan

* To whom correspondence should be addressed. E-mail: k.kishida{at}materials.mbox.media.kyoto-u.ac.jp

The crystal and defect structures of coarse-grained crystals of La2/3–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–xLi3xTiO3 have a Li-poor composition of La0.57Li0.29TiO3 and a diagonal-type unit cell of 21/2ap x 21/2ap x 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.

Keywords     crystal structure, transmission electron microscopy, perovskites, solid electrolytes, precipitates

Received      4 April 2007, accepted 22 October 2007


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