Acta Crystallographica Section B

Structural Science

Volume 59, Part 6 (December 2003)

research papers

Acta Cryst. (2003). B59, 701-708 [ doi:10.1107/S0108768103021761 ]

Structural refinements of high-pressure phases in germanium dioxide

K. Shiraki, T. Tsuchiya and S. Ono

Abstract: Recently, there has been substantial interest in the new high-pressure polymorphs of GeO₂ synthesized in the laboratory. Previous investigators reported the synthesis of `CaCl₂-type', ` [alpha] -PbO₂-type' and `pyrite-type (modified-fluorite-type)' GeO₂ at pressures of 30-130 GPa in laser-heated diamond anvil cells. In order to provide definitive information about the new high-pressure polymorphs, we performed Rietveld refinements of the structures. The structure refinements confirm that two of these high-pressure phases do have the [alpha] -PbO₂-type and pyrite-type (modified-fluorite-type) structures.

Keywords: germanium dioxide; CaCl₂-type; -PbO₂-type; pyrite-type; modified fluorite-type; phase transition; structural refinement.


	Rietveld powder data file (CIF format) (56.0 kbytes) Contains datablock I

	Rietveld powder data file (CIF format) (40.9 kbytes) Contains datablock II

	Rietveld powder data file (CIF format) (38.4 kbytes) Contains datablock III

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