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Pressure-induced instabilities of low-dimensional structural units in chalcogenide glasses at ambient temperature

S. SEN1,* , S. SOYER-UZUN1, E. L. GJERSING1, B. G. AITKEN2, S. GAUDIO3, A. N. CLARK3, C. E. LESHER3

Affiliation

  1. Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, USA
  2. aGlass Research Division, SP-FR-05-1, Corning Incorporated, Corning, NY 14831, USA
  3. Department of Geology, University of California, Davis, CA 95616, USA

Abstract

Relatively abrupt pressure-induced structural changes have been observed at ambient temperature in low-dimensional chalcogenide glasses in the Ge-As-P-S system. Raman and 31P NMR spectroscopic measurements on pressure-quenched samples indicate that these structural changes correspond to a collapse of the low-dimensional molecular and ring-like structural units in these glasses into 3-dimensionally connected network at high pressure. The molecular-to-network transition is found to be reversible at high temperature above Tg and kinetic studies indicate that the extent of these structural changes is time-dependent at ambient temperature..

Keywords

Chalcogenide, Glass, Pressure-induced instabilities.

Submitted at: Oct. 23, 2007
Accepted at: Nov. 16, 2007

Citation

S. SEN, S. SOYER-UZUN, E. L. GJERSING, B. G. AITKEN, S. GAUDIO, A. N. CLARK, C. E. LESHER, Pressure-induced instabilities of low-dimensional structural units in chalcogenide glasses at ambient temperature, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 11, pp. 3553-3557 (2007)