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Figure 7
Powder patterns taken at several temperatures. The indices of the most representative Bragg reflections with respect to the orthorhombic [P2_{1}2_{1}2] cell are reported. Some peaks split below 150 K, thus indicating the orthorhombic distortion. The splitting of the pairs 400 + 040 or 240 + 420 is especially remarkable. The superstructure reflections (h + k = 2n+1), such as 230 or 141, are already observed at 170 K, where the orthorhombic distortion is not yet noticeable.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 59| Part 5| September 2003| Pages 625-633
doi:10.1107/S0108768103019013
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