High-precision measurements of the compressibility of chalcogenide glasses at a hydrostatic pressure up to 9 GPa

Brazhkin, V.; Bychkov, E.; Tsiok, O.
August 2016
Journal of Experimental & Theoretical Physics;Aug2016, Vol. 123 Issue 2, p308
Academic Journal
The volumes of glassy germanium chalcogenides GeSe, GeS, GeSe, and GeSe are precisely measured at a hydrostatic pressure up to 8.5 GPa. The stoichiometric GeSe and GeS glasses exhibit elastic behavior in the pressure range up to 3 GPa, and their bulk modulus decreases at pressures higher than 2-2.5 GPa. At higher pressures, inelastic relaxation processes begin and their intensity is proportional to the logarithm of time. The relaxation rate for the GeSe glasses has a pronounced maximum at 3.5-4.5 GPa, which indicates the existence of several parallel structural transformation mechanisms. The nonstoichiometric glasses exhibit a diffuse transformation and inelastic behavior at pressures above 1-2 GPa. The maximum relaxation rate in these glasses is significantly lower than that in the stoichiometric GeSe glasses. All glasses are characterized by the 'loss of memory' of history: after relaxation at a fixed pressure, the further increase in the pressure returns the volume to the compression curve obtained without a stop for relaxation. After pressure release, the residual densification in the stoichiometric glasses is about 7% and that in the GeSe glasses is 1.5%. The volume of the GeSe glass returns to its initial value within the limits of experimental error. As the pressure decreases, the effective bulk moduli of the GeSe and GeSe glasses coincide with the moduli after isobaric relaxation at the stage of increasing pressure, and the bulk modulus of the stoichiometric GeSe glass upon decreasing pressure noticeably exceeds the bulk modulus after isobaric relaxation at the stage of increasing pressure. Along with the reported data, our results can be used to draw conclusions regarding the diffuse transformations in glassy germanium chalcogenides during compression.


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