Chalcogenide

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Local Environment of Indium in ‎Ge23.33Se64.67In12 Chalcogenide Glass

Journal Title, Volume, Page: 
Materials Letters Volume 35, Issues 5–6 , Pages 309–313
Year of Publication: 
1998
Authors: 
G. Saffarini
Physics Department, An-Najah National University, Nablus, Palestine
Current Affiliation: 
Department of Physics, Faculty of Science, An-Najah National University, Palestine
J.M. Saiter
Laboratoire d'Etude et de Caracterisation des Amorphes et des Polymères, Faculté des Sciences, Université de Rouen, 76821 Mont Saint Aignan CEDEX, France
J. Ledru
Laboratoire d'Etude et de Caracterisation des Amorphes et des Polymères, Faculté des Sciences, Université de Rouen, 76821 Mont Saint Aignan CEDEX, France
S. Benazeth
LURE, Bâtiment 209d, Université de Paris-Sud, 91405 Orsay Cedex, France
Preferred Abstract (Original): 

EXAFS measurements, from the In K edge, on Ge23.33Se64.67In12 glass, have been performed. For this glass, it is found that In is only coordinated with Se atoms. By complementing the EXAFS results obtained from the fitting procedure followed in this work with the earlier reported DSC results obtained on this system, it is concluded that in this glass, the coordination number of In is equal to three. Moreover, this approach of coupling EXAFS with DSC results allows one to calibrate the Γ factor for systems which lack a reference material, or systems for which an ab initio calculation cannot be performed, as in our case.

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Extended X-Ray Absorption Fine Structure Study on Bi Modified Ges Bulk Glasses

Journal Title, Volume, Page: 
Journal of Optoelectronics and Advanced Materials Vol. 3, No. 2, June 2001, p. 485 - 490
Year of Publication: 
2001
Authors: 
G. Saffarini
Department of Physics, Faculty of Sciences, An-Najah National University, Palestine
Current Affiliation: 
Department of Physics, Faculty of Sciences, An-Najah National University, Palestine
J. M. Saitera
Laboratoire d’Etude et de Caractérisation des Amorphes et des polymères, Faculté des Sciences, Université de Rouen, 76821 Mont Saint Aignan CEDEX, France
A. Zumailana
Department of Physic, Faculty of Sciences and Education, University of Aden, Republic of Yemen
Preferred Abstract (Original): 

EXAFS measurements have been performed from the Ge K edge and Bi LIII 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 of Bi contradicts the conclusion of Elliot and Steel. On the basis of the obtained CN 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.

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