Stress measurement under high pressure using Kawai-type multi-anvil apparatus combined with synchrotron radiation

Yu Nishihara, Ken Ichi Funakoshi, Yuji Higo, Hidenori Terasaki, Norimasa Nishiyama, Tomoaki Kubo, Akira Shimojuku, Noriyoshi Tsujino

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

A system for stress measurement under high pressure has been developed at beamline BL04B1, SPring-8, Japan. A Kawai-type multi-anvil apparatus, SPEED-1500, was used to pressurize polycrystalline KCl to 9.9 GPa in a mechanically anisotropic cell assembly with the KCl sample sandwiched between dense Al2O3 pistons. The variation of deviatoric stress was determined from the lattice distortion measured using two-dimensional X-ray diffraction with monochromatic synchrotron X-rays. The low-pressure B1 phase transformed to the high-pressure polymorph B2 during compression. The deviatoric stress increased with increasing pressure in both the B1 and B2 phases except for the two-phase-coexisting region at a pressure of 2-3 GPa. This new system provides one of the technical foundations for conducting precise rheological measurements at conditions of the Earths lower mantle.

Original languageEnglish
Pages (from-to)757-761
Number of pages5
JournalJournal of Synchrotron Radiation
Volume16
Issue number6
DOIs
Publication statusPublished - 2009
Externally publishedYes

Keywords

  • High pressure
  • KCl
  • Phase transition
  • Stress measurement
  • Two-dimensional X-ray diffraction

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation

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