Caractère impropre de la transition ferroélastique du niobate de baryum et de sodium
- 1 January 1975
- journal article
- Published by EDP Sciences in Journal de Physique Lettres
- Vol. 36 (5) , 141-143
- https://doi.org/10.1051/jphyslet:01975003605014100
Abstract
On établit expérimentalement, par diffusion Brillouin, que l'anisotropie élastique (C22 - C11) de Ba2NaNb 5O15 croît entre la température ambiante et la transition ferroélastique à 300 °C. Ce comportement exclut que la déformation spontanée puisse constituer le paramètre d'ordre de la transition. La transition ferroélastique est de type impropreKeywords
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