Short range order in Ge-Ga-Se glasses

I. Pethes, R. Chahal, V. Nazabal, C. Prestipino, A. Trapananti, C. Pantalei, B. Beuneu, B. Bureau, P. Jóvári

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Short range order of glassy Ge20Ga10Se70 and Ge20Ga5Se75 was investigated by neutron diffraction and extended X-ray absorption fine structure spectroscopy (EXAFS) at Ge, Ga and Se K-edges. For each composition large scale structural models were obtained by fitting simultaneously the four experimental datasets in the framework of the reverse Monte Carlo simulation technique. It was found that both Ge and Ga are predominantly fourfold coordinated. The quality of the fits was strongly improved by introducing Ge-Ga bonding. Models giving the best agreement with experimental data show that Ga has a complex effect on the Ge-Se host matrix: i) it enters the covalent network by forming Ga-Ge bonds ii) by decreasing the number of Se atoms around Ge, it contributes to the formation of Se-Se bonds, which may explain the higher solubility of lanthanide ions iii) the average coordination number of Se increases due to the Ga-Se 'extra' bonds. The higher average coordination of the network may be responsible for the increase of Tg upon adding Ga to Ge-Se glasses.

Original languageEnglish
Pages (from-to)578-584
Number of pages7
JournalJournal of Alloys and Compounds
Volume651
DOIs
Publication statusPublished - Dec 5 2015

Fingerprint

Extended X ray absorption fine structure spectroscopy
Glass
Lanthanoid Series Elements
Neutron diffraction
Rare earth elements
Solubility
Ions
Atoms
Chemical analysis
Monte Carlo simulation

Keywords

  • Chalcogenide glasses
  • EXAFS
  • Ge-Ga-Se
  • Neutron diffraction
  • RMC
  • Structure

ASJC Scopus subject areas

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

Cite this

Pethes, I., Chahal, R., Nazabal, V., Prestipino, C., Trapananti, A., Pantalei, C., ... Jóvári, P. (2015). Short range order in Ge-Ga-Se glasses. Journal of Alloys and Compounds, 651, 578-584. https://doi.org/10.1016/j.jallcom.2015.08.039

Short range order in Ge-Ga-Se glasses. / Pethes, I.; Chahal, R.; Nazabal, V.; Prestipino, C.; Trapananti, A.; Pantalei, C.; Beuneu, B.; Bureau, B.; Jóvári, P.

In: Journal of Alloys and Compounds, Vol. 651, 05.12.2015, p. 578-584.

Research output: Contribution to journalArticle

Pethes, I, Chahal, R, Nazabal, V, Prestipino, C, Trapananti, A, Pantalei, C, Beuneu, B, Bureau, B & Jóvári, P 2015, 'Short range order in Ge-Ga-Se glasses', Journal of Alloys and Compounds, vol. 651, pp. 578-584. https://doi.org/10.1016/j.jallcom.2015.08.039
Pethes I, Chahal R, Nazabal V, Prestipino C, Trapananti A, Pantalei C et al. Short range order in Ge-Ga-Se glasses. Journal of Alloys and Compounds. 2015 Dec 5;651:578-584. https://doi.org/10.1016/j.jallcom.2015.08.039
Pethes, I. ; Chahal, R. ; Nazabal, V. ; Prestipino, C. ; Trapananti, A. ; Pantalei, C. ; Beuneu, B. ; Bureau, B. ; Jóvári, P. / Short range order in Ge-Ga-Se glasses. In: Journal of Alloys and Compounds. 2015 ; Vol. 651. pp. 578-584.
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