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Article Dans Une Revue Materials Chemistry and Physics Année : 2013

Incorporation of Ga into the structure of Ge-Se glasses

Résumé

The structure of Ga-containing Ge-Se glasses is studied by high-resolution X-ray photoelectron and extended X-ray absorption fine-structure spectroscopies. The results show that in GaxGeySe100-x-y glasses both Ga and Ge atoms are 4-fold coordinated, whereas Se atoms are 2-fold coordinated. For Se-deficit samples with Se content less than 67 at.%, Ge-Ge(Ga) bonds appear. First, Ge-Ge bonds are formed indicating preference for the formation of (Se)2 > Ga < (Se)2 units over the regular GeSe4/2 tetrahedra. Metal-Ga bonds appear only in the most Se-deficit sample. Addition of Ga facilitates more uniform Se distribution in comparison to binary Ge-Se or ternary As(Sb)-Ge-Se systems. The observed structural features are correlated with some basic thermo-mechanical properties of the investigated glasses.

Dates et versions

hal-00848985 , version 1 (29-07-2013)

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R. Golovchak, Laurent Calvez, Elena Petracovschi, Bruno Bureau, D. Savytskii, et al.. Incorporation of Ga into the structure of Ge-Se glasses. Materials Chemistry and Physics, 2013, 138 (2-3), pp.909-916. ⟨10.1016/j.matchemphys.2012.12.084⟩. ⟨hal-00848985⟩
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