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Short‐Range Order in Ge – As – Te Glasses
Author(s) -
Jóvári Pál,
Lucas Pierre,
Yang Zhiyong,
Bureau Bruno,
Kaban Ivan,
Beuneu Brigitte,
Bednarčik Jozef
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12823
Subject(s) - extended x ray absorption fine structure , crystallography , diffraction , germanium , coordination number , materials science , absorption (acoustics) , chemistry , absorption spectroscopy , optics , physics , silicon , optoelectronics , composite material , ion , organic chemistry
The structure of Te‐rich (75–80 at.% Te) and Te‐poor (40 at.% Te) Ge–As–Te glasses has been investigated by diffraction and extended X‐ray absorption fine structure ( EXAFS ) measurements. Large‐scale structural models have been created by fitting simultaneously diffraction and EXAFS datasets by the reverse Monte Carlo simulation technique. It is found that As–As bonds improve the fit quality in the case of Te‐rich glasses while no Ge–Ge bonding is necessary in these compositions. In the Te‐poor glasses, Te–Te homopolar bonds are also observed while Ge binds preferentially to Te rather than to As. Ge–As and Ge–Te coordination numbers do not change significantly with increasing Ge content.