Elsevier

Solid State Ionics

Volume 1, Issues 5–6, December 1980, Pages 355-365
Solid State Ionics

Anion disorder and ionic motion in lead fluoride (β-PbF2)

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Abstract

The anion disorder in β-PbF2 has been investigated as a function of temperature by single crystal X-ray diffraction. The results show strong anharmonic thermal vibrations of the F ions along the body diagonals in the direction of the tetrahedral faces of the Pb2+ ions. The mobile F ions move along a path which leads through the unoccupied octahedron at the center of the elementary cell but this path does not pass through the center of this octahedron. The lattice constant shows a rapid increase near 700 K. Above this temperature the F ions occupy split positions around their regular lattice sites.

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  • Cited by (0)

    Present address: Institute of Scientific and Industrial Research, Osaka University, Yamadakami, Suita, Osaka 565, Japan.

    ∗∗

    Present address: Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA.

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