Local order in binary Ge-Te glasses - An experimental study

JOURNAL OF ALLOYS AND COMPOUNDS

卷:771

Article

Jovari, Pal¹  Piarristeguy, Andrea²  Pradel, Annie²  Pethes, Ildiko¹  Kaban, Ivan³  Michalik, Stefan⁴  Darpentigny, Jacques⁵  Chernikov, Roman⁶ 

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

[2] Univ Montpellier, Inst Charles Gerhardt, CNRS, UMR 5253,CC1503, Pl E Bataillon, F-34095 Montpellier 5, France

[3] IFW Dresden, Inst Complex Mat, 01171 Helmholtzstr 20, D-01069 Dresden, Germany

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

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

[6] Deutsch Elektronen Synchrotron DESY, Notkestr 85, D-22603 Hamburg, Germany

关键词: Telluride glass;    Modelling;    Diffraction;    EXAFS;    Simulation;   

DOI  :  10.1016/j.jallcom.2018.08.323

来源: Elsevier

【 摘 要 】

The structure of GexTe100-x (x = 14.5, 18.7, 23.6) glasses prepared by twin roller quenching technique was investigated by neutron diffraction, X-ray diffraction and Ge-K-edge X-ray absorption spectroscopy measurements. Large scale structural models were obtained for each composition by fitting the experimental datasets in the framework of the reverse Monte Carlo technique. It was found that the majority of Ge and Te atoms satisfy the 8-N rule. Simulation results indicate that Ge-Ge bonding is not significant for x = 14.5 and 18.7. The shape and position of the first peak of the Ge-Ge partial pair correlation function evidence the presence of corner sharing tetrahedra already in compositions (x = 14.5 and 18.7) where 'sharing' of a Te atom by two Ge atoms could be avoided due to the low concentration of Ge. (c) 2018 Published by Elsevier B.V.

【 授权许可】

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