The equation of state of polyamorphic germania glass: A two-domain description of the viscoelastic response

K. H. Smith, E. Shero, Andrew Chizmeshya, George Wolf

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

We have measured the quasistatic room temperature equation of state of GeO2 glass under hydrostatic conditions to 7.1 GPa. From ambient pressure to 4 GPa the compression displays completely reversible elastic behavior. Above 4 GPa the glass becomes anelastic and exhibits a dramatic increase in the static compressibility. This change in elastic response is concomitant with the onset of the previously reported pressure-induced germanium coordination change. The equation of state data can be quantitatively described by a two-domain model composed of four- and six-coordinated germanium clusters. The model accurately reproduces the previously measured change in the average Ge-O bond length of germania with pressure and rationalizes the different pressure dependent compressional behavior observed in quasistatic and ultrasonic measurements. We further conjecture that the vitreous polyamorphism exhibited by germania glass at high pressures, and the pressure-induced crystal-to-amorphous transition of quartz-isotypic GeO2, both result from similar underlying coordination instabilities in the germania tetrahedral framework.

Original languageEnglish (US)
Pages (from-to)6851-6857
Number of pages7
JournalThe Journal of Chemical Physics
Volume102
Issue number17
StatePublished - 1995

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Germanium
Equations of state
germanium
equations of state
Glass
glass
Ultrasonic measurement
hydrostatics
Quartz
compressibility
Bond length
Compressibility
quartz
ultrasonics
room temperature
Crystals
crystals

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

The equation of state of polyamorphic germania glass : A two-domain description of the viscoelastic response. / Smith, K. H.; Shero, E.; Chizmeshya, Andrew; Wolf, George.

In: The Journal of Chemical Physics, Vol. 102, No. 17, 1995, p. 6851-6857.

Research output: Contribution to journalArticle

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