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

DOI: 10.1016/j.jallcom.2018.08.323 DOI Help

Authors: P. Jóvári (Institute for Solid State Physics, Hungary) , A. Piarristeguy (Institut Charles Gerhardt, UMR 5253 CNRS) , A. Pradel (Institut Charles Gerhardt, UMR 5253 CNRS) , I. Pethes (Institute for Solid State Physics, Hungary) , I. Kaban (IFW Dresden) , S. Michalik (Diamond Light Source) , J. Darpentigny (CEA-Saclay) , R. Chernikov (Deutsches Elektronen Synchrotron DESY)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Alloys And Compounds

State: Published (Approved)
Published: September 2018
Diamond Proposal Number(s): 14465

Abstract: 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.

Journal Keywords: Telluride glass; Modelling; Diffraction; exafs; Simulation

Subject Areas: Materials, Physics

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Other Facilities: PETRA III at DESY