Abstract
A congruently melting single crystal of nonstoichiometric phase Sr0.71Ce0.29F2.29 crystallizing into the CaF2 structural type (sp. gr Fm $\bar 3$ m) has been studied by X-ray diffraction analysis. Vacancies in the main fluorine position 8c and interstitial anions in two 32f positions have been found. The ratio of the structural defects in the Sr0.71Ce0.29F2.29 solid solution corresponds to the tetrahedral configuration of the defect cluster {Sr4 − n Ce n F26}.
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