Brillouin Scattering Investigations of Cerium Fluoride at High Temperature: A Diffuse Superionic Transition
- 22 August 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 61 (8) , 978-981
- https://doi.org/10.1103/physrevlett.61.978
Abstract
The complete set of acoustic-mode frequencies associated with elastic constants in cerium fluoride have been measured by Brillouin scattering to temperatures of about 1500 K. These frequencies decrease linearly from 300 to about 1150 K. Above 1150 K striking deviations from linear behavior are observed. The results are discussed in terms of anharmonicity and a diffuse superionic transition in which the development of disorder proceeds by means of cooperative mechanism.Keywords
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