Neutron diffraction study of the structure of the antifluorite crystal (NH4)2TeCl6
- 1 February 1991
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Physics
- Vol. 69 (2) , 137-141
- https://doi.org/10.1139/p91-020
Abstract
A neutron diffraction study of the crystal structure of (NH4)2TeCl6 is presented. The data support a previous contention that this crystal undergoes a ferrorotative structural phase transition at 85 K, from a cubic structure with space group Oh5 to a trigonal structure with space group C3i2. The primary-order parameter is the rotation angle, Φ, of the TeCl6 octahedra about a [111] axis of the cubic phase. The data indicate that the temperature dependence of Φ is non-mean-field like over an extended reduced temperature range.Keywords
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