The crystal structures of methylammonium hexachlorostannate(IV) in the high- and low-temperature phases studied by X-rays.
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概要
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The title compound crystallizes in the trigonal space group R\bar3m with <I>a</I>=7.171, <I>c</I>=21.952 Å, and <I>Z</I>=3 at 298 K. The crystal structures at 298 and 120 K, as well as the lattice parameters in the temperature range 113–298 K, have been determined by X-rays, in order to elucidate the mechanism of the phase transition occurring at <I>T</I><SUB>t</SUB>=156 K. The structure of the high-temperature phase is essentially the same as that determined by Wyckoff, except for the discrimination between C and N atoms. No change in the space group nor in the basic structure was detected over the temperature range studied, in spite of a strong suggestion from previous <SUP>35</SUP>Cl-NQR measurements. A small but significant anomaly associated with the transition is recognized in the c axis, which retains almost the same length near and below <I>T</I><SUB>t</SUB>. As a result, the lattice shrinkage below <I>T</I><SUB>t</SUB> becomes increasingly anisotropic as the temperature is lowered, whereas the thermal expansion above it is relatively isotropic.
- 公益社団法人 日本化学会の論文
著者
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Kitahama Katsuki
The Institute Of Scientific And Industrial Research Osaka University
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Kiriyama Hideko
The Institute of Scientific and Industrial Research, Osaka University
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Baba Yoshihisa
The Institute of Scientific and Industrial Research, Osaka University
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