The structure of superionic compounds by powder neutron diffraction. I. Cation distribution in α-AgI
- 14 July 1977
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 10 (13), 2261-2267
- https://doi.org/10.1088/0022-3719/10/13/003
Abstract
A powder neutron diffraction study of alpha -AgI has been carried out at several temperatures between 180 degrees C and 450 degrees C. The results do not support the widely quoted model for the distribution of silver ions originally proposed by Strock (1934-36) but instead indicate the silver ions are confined to the twelve tetrahedral sites of the body-centred cubic structure. Remarkably large temperature factors are observed and it is postulated that there is a large anharmonic contribution to the thermal vibrations arising from a reduced energy barrier in the direction of the octahedral sites.Keywords
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