Abstract
The high pressure structures of AX2 compounds have been refined in situ up to 60 GPa in a diamond anvil cell with an imaging plate in the angle dispersive mode using a low power laboratory x-ray tube and/ or synchrotron radiation. Results for GeO2 obtained using both sources are compared. Under the same conditions (pressure, hydrostaticity, completion of phase transformations), the refinements by the Rietveld method yielded identical atomic positions and cell parameters. A structure map of the AX2 compounds as a function of the coordination number has been established. The transition pathways depend on the filling of the d orbitals.
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