As2Te3 glass under high hydrostatic pressure: Polyamorphism, relaxation, and metallization

V. V. Brazhkin, E. Bychkov, and O. B. Tsiok
Phys. Rev. B 95, 054205 – Published 22 February 2017

Abstract

High-precision measurements of the specific volume and electrical resistivity of As2Te3 glasses are performed under hydrostatic pressures up to 8.5 GPa. A smooth transformation and logarithmic relaxation of the density is observed at pressures higher than 1 GPa. The softening of the effective bulk modulus and the relaxation rate have a sharp maximum at 2.5 GPa, which is indicative of the existence of polyamorphism. At pressures above 4.5 GPa, a new relaxation process begins. During decompression, the pressure dependence of the compressibility exhibits a kink near 4 GPa. The electrical resistivity decreases by almost 8 orders of magnitude, most sharply in the range of 2–3.5 GPa (by 3 orders of magnitude). Smooth metallization occurs at a pressure of 5 GPa; the resistivity decreases to a value of 1.7×104Ωcm at 8.1 GPa. Under decompression, the electrical resistivity exhibits a hysteresis and returns to values 3 orders of magnitude smaller than the initial one. The volume and electrical resistivity under normal conditions relax to quasiequilibrium values in several months. The relaxed glasses with a smaller chemical disorder have a lower electrical resistivity. The results together with the data on the structure and dynamics in As2Te3 glasses allow conclusions on the mechanism of pressure-induced transformations.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
3 More
  • Received 15 November 2016
  • Revised 30 January 2017

DOI:https://doi.org/10.1103/PhysRevB.95.054205

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

V. V. Brazhkin1,*, E. Bychkov2, and O. B. Tsiok1

  • 1Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow 108840, Russia
  • 2LPCA, UMR 8101 CNRS, Université du Littoral, 59140 Dunkerque, France

  • *Corresponding author: brazhkin@hppi.troitsk.ru

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 95, Iss. 5 — 1 February 2017

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×