TY - JOUR

T1 - High-Precision Studies of the Compressibility and Relaxation of g-As2S3 Glasses at High Hydrostatic Pressures up to 8.6 GPa

AU - Brazhkin, V. V.

AU - Bychkov, E.

AU - Tver’yanovich, A. S.

AU - Tsiok, O. B.

N1 - Funding Information: This work was supported by the Russian Science Foundation, project no. 19-12-00111. Publisher Copyright: © 2020, Pleiades Publishing, Inc. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/4/1

Y1 - 2020/4/1

N2 - The high-precision volume measurements of the g-As2S3 glass have been performed at high hydrostatic pressures up to 8.6 GPa, and room temperature. The glass behaves elastically during compression only at pressures up to 1.5 GPa; at higher pressures, a smooth transformation and inelastic density relaxation (logarithmic in time) take place. In the initial segment, the bulk modulus is B = 13.5 +/- 0.15 GPa and its pressure derivative is dB/dP = 6.2 +/- 0.2. When pressure increases further, the relaxation rate passes through a maximum at 4 GPa, which is accompanied by a bulk modulus plateau, and then decreases and remains noticeable up to the maximum pressure. When pressure decreases, inelastic behavior and the reverse transformation are observed at pressures below 4 GPa. After pressure release, the g-As2S3 glasses have a residual densification of about 3% and their optical properties differ substantially from the initial ones. The glass density relaxes to a quasi-equilibrium value in several months under normal conditions. The kinetics of the Raman spectrum and the optical absorption edge of the glasses during relaxation is studied under normal pressure. The data on compressibility of glasses and comparative Raman studies of initial and compacted glasses show that at pressures up to 9 GPa, there is a strong increase in chemical disorder in the glass, while there is no significant change in the coordination number.

AB - The high-precision volume measurements of the g-As2S3 glass have been performed at high hydrostatic pressures up to 8.6 GPa, and room temperature. The glass behaves elastically during compression only at pressures up to 1.5 GPa; at higher pressures, a smooth transformation and inelastic density relaxation (logarithmic in time) take place. In the initial segment, the bulk modulus is B = 13.5 +/- 0.15 GPa and its pressure derivative is dB/dP = 6.2 +/- 0.2. When pressure increases further, the relaxation rate passes through a maximum at 4 GPa, which is accompanied by a bulk modulus plateau, and then decreases and remains noticeable up to the maximum pressure. When pressure decreases, inelastic behavior and the reverse transformation are observed at pressures below 4 GPa. After pressure release, the g-As2S3 glasses have a residual densification of about 3% and their optical properties differ substantially from the initial ones. The glass density relaxes to a quasi-equilibrium value in several months under normal conditions. The kinetics of the Raman spectrum and the optical absorption edge of the glasses during relaxation is studied under normal pressure. The data on compressibility of glasses and comparative Raman studies of initial and compacted glasses show that at pressures up to 9 GPa, there is a strong increase in chemical disorder in the glass, while there is no significant change in the coordination number.

KW - OPTICAL-PROPERTIES

KW - AS2S3

KW - POLYAMORPHISM

UR - http://www.scopus.com/inward/record.url?scp=85085241350&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/4ef50967-6f6e-3e48-bc0a-721af9a84bf7/

U2 - 10.1134/S1063776120030024

DO - 10.1134/S1063776120030024

M3 - Article

AN - SCOPUS:85085241350

VL - 130

SP - 571

EP - 578

JO - Journal of Experimental and Theoretical Physics

JF - Journal of Experimental and Theoretical Physics

SN - 1063-7761

IS - 4

ER -