Short‐Range Order in Ge – As – Te Glasses
2014; Wiley; Volume: 97; Issue: 5 Linguagem: Inglês
10.1111/jace.12823
ISSN1551-2916
AutoresP. Jóvári, Pierre Lucas, Zhiyong Yang, Bruno Bureau, I. Kaban, B. Beuneu, Jozef Bednarčík,
Tópico(s)Crystal Structures and Properties
ResumoThe 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.
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