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Article Dans Une Revue Journal of the American Ceramic Society Année : 2010

Permanent Ge Coordination Change Induced by Pressure in La 2 O 3 –B 2 O 3 –GeO 2 Glass

Résumé

In this study, we report the results of an in situ X‐ray absorption spectroscopy investigation of the La 2 O 3 –B 2 O 3 –GeO 2 (LBG) glass compressed in a diamond anvil cell until 17 GPa at ambient temperature. A pressure‐induced coordination change of germanium from fourfold to sixfold is shown here. The analysis of Ge K‐edge X‐ray absorption near‐edge structure spectra supports a model of mixing of fourfold and sixfold coordinated Ge sites during the compression/decompression cycle. This transformation proves to be irreversible: about 25% of sixfold coordinated Ge still exists at ambient pressure. This phenomenon underlines a polymorphism property of the LBG glass, whose origin lies in the complexity of composition.

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hal-04549573 , version 1 (17-04-2024)

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Camille Coussa-Simon, Christine Martinet, Dominique de Ligny, Thierry Deschamps, Angela Trapananti, et al.. Permanent Ge Coordination Change Induced by Pressure in La 2 O 3 –B 2 O 3 –GeO 2 Glass. Journal of the American Ceramic Society, 2010, 93 (9), pp.2726-2730. ⟨10.1111/j.1551-2916.2010.03797.x⟩. ⟨hal-04549573⟩
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