Superstructure Analyses on Single Crystals of Li0.8VO2
1995; Elsevier BV; Volume: 114; Issue: 1 Linguagem: Inglês
10.1006/jssc.1995.1026
ISSN1095-726X
AutoresKatsuhiro Imai, Hiroshi Sawa, Masayoshi Koike, Masashi Hasegawa, Humihiko Takei,
Tópico(s)Gas Sensing Nanomaterials and Sensors
ResumoFlux-grown single crystals of ordered rock-salt-type Li1-xVO2 (x ≈ 0.2), which form a significant superstructure in the ab-plane and along the c-axis at room temperature, have been analyzed by EXAFS and X-ray diffraction methods. The results show that two-dimensionally oriented V ions in the ab-plane form a cluster of triangular V3 trimers with a displacement of 0.160 Å from the unclustered position and that the superstructure along the c -axis is due to a stacking order of the V3 trimers along the c -axis. The intensities of the superstructure patterns in X-ray precession photographs are analyzed in terms of the periodic intensity distribution (PID) function, and the most common diffraction streak is caused by a racemate-like stacking sequence of the clustered V layers.
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