Extended X-Ray Absorption Fine Structure Study on Bi Modified GeS Bulk Glasses
UNIVERSITE DE ROUEN CEDEX (FRANCE)
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EXAFS measurements have been performed from the Ge K edge and Bi L111 edge on GeSBi glasses with 6, 8 and 16 Bi at., and on crystalline Bi2S3. As expected, Ge is found to be fourfold coordinated with S atoms. It is also found that Bi is only coordinated with S with a coordination number CN-4. This result for the CN-4. of Bi contradicts the conclusion of Elliot and Steel. On the basis of the obtained CN-4. of Bi, it is possible to exclude the presence of Bi2S3 microcrystalline inclusions and to assert that these glasses are homogeneous at the microscopic level.
- Ceramics, Refractories and Glass
- Atomic and Molecular Physics and Spectroscopy