Logarithmic Relaxation of the Specific Volume and Optical Properties of GeS2 Densified Glass

• Published in: Journal of experimental and theoretical physics 2022-01, Vol.134 (1), p.51-59
• Main Authors: Tsiok, O. B., Brazhkin, V. V., Tverjanovich, A. S., Bychkov, E.
• Format: Article
• Language: English
• Subjects: Absorption; Bulk modulus; Classical and Quantum Gravitation; Densification; Elementary Particles; Germanium sulfide; Hydrostatic pressure; Optical measurement; Optical properties; Particle and Nuclear Physics; Physics; Physics and Astronomy; Pressure dependence; Quantum Field Theory; Relativity Theory; Room temperature; Solid State Physics; Solids and Liquids; Specific volume
• ISSN: 1063-7761; 1090-6509
• DOI: 10.1134/S1063776122010046

The relaxation of the optical absorption edge and of the linear sizes of stoichiometric GeS 2 glass densified at a high hydrostatic pressure have been studied. Precision data have been obtained on the pressure dependence of the specific volume and the bulk compression modulus upon an increases and decrease of pressure in the range up to 8 GPa, including long-term volume relaxation at room temperature after the removal of pressure. The residual densification of glass after the action of pressure of 8.3 GPa with hold-up for 20 h was 9.5% immediately after the removal of pressure and 8% at the beginning of optical measurements with a corresponding absorption edge shift by 170 nm. The relaxation of the optical absorption edge and of the linear sizes has been investigated at room temperature as well as in a series of subsequent annealings right to the return of glass to its initial state. Two processes that have been singled out are both linear in logarithmic time with close relaxation curve slopes, but with rates differing by two orders of magnitude. The relaxation activation energy lies in interval 1.60–1.77 eV, increasing with temperature. A possible mechanism of logarithmic relaxation of glass properties is considered.