Abstract
Determination structurale a 300 K (phase basse conductivite) et 448 K (phase super-ionique). Utilisation de la methode Rietveld afin de determiner les positions atomiques, les occupations de sites et les facteurs de temperature des atomes legers D et O. Le mecanisme de diffusion de D est discute. A 300 K, cristallisation dans P2 1 /c avec a=7,78013, b=8,13916, c=7,72187 A, β=110,8720°, affinement jusqu'a R=4,19%. A 448 K, cristallisation dans Z4 1 /amd avec a=5,74147, c=14,31508 A, affinement jusqu'a R=2,21%
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