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 language | English |
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Pages (from-to) | 757-761 |
Number of pages | 5 |
Journal | Journal of Synchrotron Radiation |
Volume | 16 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2009 |
Externally published | Yes |
Keywords
- High pressure
- KCl
- Phase transition
- Stress measurement
- Two-dimensional X-ray diffraction
ASJC Scopus subject areas
- Radiation
- Nuclear and High Energy Physics
- Instrumentation