Abstract

The Ge coordination changes in oxides have been investigated by XAFS at high pressure and high temperature using the energy dispersive configuration of the DCI storage ring of LURE (Orsay, France). Two different experimental set-up were used to investigate both tetrahedra-to-octahedra (high pressure and temperature) and octahedra-to-tetrahedra (high temperature) changes. The network compression and dilatation are found to be precursor of phase transformations occuring under these extreme conditions.

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