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Short range order and topology of Ge Ga Te100-2 glasses

DOI: 10.1016/j.jallcom.2020.155097 DOI Help

Authors: I. Pethes (Institute for Solid State Physics, Hungary) , A. Piarristeguy (ICGM, Univ Montpellier, CNRS, ENSCM) , A. Pradel (ICGM, Univ Montpellier, CNRS, ENSCM) , Stefan Michalik (Diamond Light Source) , R. Nemausat (Deutsches Elektronen Synchrotron DESY) , J. Darpentigny (CEA-Saclay) , P. Jóvári (Institute for Solid State Physics, Hungary)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Alloys And Compounds , VOL 834

State: Published (Approved)
Published: September 2020
Diamond Proposal Number(s): 19662

Abstract: 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.

Journal Keywords: Chalcogenide glasses; Ge-Ga-Te; Structure; Diffraction; EXAFS; RMC

Subject Areas: Materials, Physics

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

Other Facilities: beamline 7C2 at LLB (Saclay, France); beamline PG5 at PETRAIII (Hamburg, Germany)