Elasticity and rheology of platinum under high pressure and nonhydrostatic stress

Abby Kavner, Thomas S. Duffy

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Using radial x-ray diffraction under nonhydrostatic compression in a diamond-anvil cell, we determine a lower bound of the yield strength of polycrystalline platinum to be 2.2 to 3.3 GPa in the pressure range of 4.2 to 22.4 GPa at room temperature. The elastic anisotropy S=2(S11-S12)/S44 of platinum is also evaluated, and is equal to 1.47(16) throughout this pressure range. In addition, platinum shows a time-dependent relaxation under nonhydrostatic stress at both ambient temperatures and, in a separate set of experiments, during laser heating. Average strain rates measured for platinum are 10-7 s-1 at 300 K and 10-5 s-1 at 1200 K, resulting in effective creep viscosities of 1015 Pa s at 300 K and 1013 Pa s at 1200(300) K.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume68
Issue number14
DOIs
StatePublished - Jan 1 2003

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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