A combined XAS and XRD Study of the High-Pressure Behaviour of GaAsO4 Berlinite

Details A combined XAS and XRD Study of the High-Pressure Behaviour of GaAsO4 Berlinite A combined XAS and XRD Study of the High-Pressure Behaviour of GaAsO4 Berlinite

1997-07-17

arxiv.org/abs/cond-mat/9707184v1

Physics

Condensed Matter

Materials Science

8 pages, 5 figures, LaTeX2e

Scientific paper

10.1209/epl/i1997-00500-3

Combined X-ray absorption spectroscopy (XAS) and X-ray diffraction (XRD) experiments have been carried out on GaAsO4 (berlinite structure) at high pressure and room temperature. XAS measurements indicate four-fold to six-fold coordination changes for both cations. The two local coordination transformations occur at different rates but appear to be coupled. A reversible transition to a high pressure crystalline form occurs around 8 GPa. At a pressure of about 12 GPa, the system mainly consists of octahedral gallium atoms and a mixture of arsenic in four-fold and six-fold coordinations. A second transition to a highly disordered material with both cations in six-fold coordination occurs at higher pressures and is irreversible.

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