Short-range order in Ge - As - Te glasses

Pál Jõvári; Pierre Lucas; Zhiyong Yang; Bruno Bureau; Ivan Kaban; Brigitte Beuneu; Jozef Bednarčik

doi:10.1111/jace.12823

Short-range order in Ge - As - Te glasses

Pál Jõvári, Pierre Lucas, Zhiyong Yang, Bruno Bureau, Ivan Kaban, Brigitte Beuneu, Jozef Bednarčik

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	1625-1632
Number of pages	8
Journal	Journal of the American Ceramic Society
Volume	97
Issue number	5
DOIs	https://doi.org/10.1111/jace.12823
State	Published - May 2014

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1111/jace.12823

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abstract = "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.",

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AU - Jõvári, Pál

AU - Lucas, Pierre

AU - Yang, Zhiyong

AU - Bureau, Bruno

AU - Kaban, Ivan

AU - Beuneu, Brigitte

AU - Bednarčik, Jozef

PY - 2014/5

Y1 - 2014/5

N2 - 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.

AB - 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.

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Short-range order in Ge - As - Te glasses

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