Short range order and topology of GexGaxTe100-2x glasses

JOURNAL OF ALLOYS AND COMPOUNDS

卷:834

Article

Pethes, I¹  Piarristeguy, A.²  Pradel, A.²  Michalik, S.³  Nemausat, R.⁴  Darpentigny, J.⁵  Jovari, P.¹ 

[1] Inst Solid State Phys, Wigner Res Ctr Phys, POB 49, H-1525 Budapest, Hungary

[2] Univ Montpellier, ENSCM, CNRS, ICGM, Montpellier, France

[3] Diamond Light Source, Harwell Sci & Innovat Campus, Didcot OX11 0DE, Oxon, England

[4] Deutsch Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany

[5] CEA Saclay, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

关键词: Chalcogenide glasses;    Ge-Ga-Te;    Structure;    Diffraction;    EXAFS;    RMC;   

DOI  :  10.1016/j.jallcom.2020.155097

来源: Elsevier

【 摘 要 】

Chemical short range order and topology of GexGaxTe100-2x glasses was investigated by neutron- and x-ray diffraction as well as Ge and Ga K-edge extended x-ray absorption fine structure (EXAFS) measurements. Large scale structural models were obtained by fitting experimental datasets simultaneously with the reverse Monte Carlo simulation technique. Models, relying only on experimental data and basic physical information without constraining the average coordination numbers, give 3.9-4.1 for the number of the atoms in the first coordination sphere of Ge atoms, while the average number of first neighbors of Ga atoms scatters around 3.8. The average coordination number of Te atoms is significantly higher than 2 for x = 12.5 and 14.3. It is found that the vast majority of MTe4 (M = Ge or Ga) tetrahedra have at least one corner sharing MTe4 neighbor. (C) 2020 The Authors. Published by Elsevier B.V.

【 授权许可】

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