Abstract

Abstract A neutron diffraction investigation of the fluorite-type Sr 1−x Bi x F 2+x (0 ⩽ x ≲ 0.50) solid solution has revealed the existence of three F′ F″ and F′″ interstitial flouride ions. The anionic distribution between normal and interstitial sites has been determined as a function of x. A clustering process has been proposed in Sr 1−x Bi x F 2+x on the basis of neutron diffraction results and of the composition dependence of electrical properties. It consists in a progressive transformation with increasing x of 3:2:3:0 clusters into “1:0:3:0” clusters.

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