Short range order in Ge-As-Se glasses

I. Pethes, I. Kaban, R. P. Wang, B. Luther-Davies, P. Jóvári

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9 Citations (Scopus)

Abstract

The structure of GexAs10Se90-x (x = 10, 17.5, 22.5, 27.5, 30, 35) glasses as well as some other compositions extensively used in infrared optics, e.g. GASIR® (Ge22As20Se58) and AMTIR-1 (Ge33As12Se55) has been investigated by X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS) measurements at the Ge, As and Se K-edges. Structural models have been obtained by fitting simultaneously XRD and EXAFS data by the reverse Monte Carlo simulation technique. Unlike other IV-V-VI glasses (e.g. Ge-As-S, Ge-Sb-Te, Ge-Sb-Se, Ge-As-Te) Ge-As-Se glasses are characterized by the lack of preferential bonding and behave as random covalent networks: Ge-Ge, Ge-As or As-As bonds can be found in Se-rich compositions while Se-Se bonding remains in strongly Se-deficient glasses as well.

Original languageEnglish
Pages (from-to)454-459
Number of pages6
JournalJournal of Alloys and Compounds
Volume623
DOIs
Publication statusPublished - Feb 25 2015

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Keywords

  • Chalcogenide glasses
  • EXAFS
  • Ge-As-Se
  • RMC
  • Structure
  • XRD

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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