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Stress measurement under high pressure using Kawai-type multi-anvil apparatus combined with synchrotron radiation.
MedLine Citation:
PMID:  19844010     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
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 Al(2)O(3) 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 Earth's lower mantle.
Authors:
Yu Nishihara; Ken-ichi Funakoshi; Yuji Higo; Hidenori Terasaki; Norimasa Nishiyama; Tomoaki Kubo; Akira Shimojuku; Noriyoshi Tsujino
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-09-15
Journal Detail:
Title:  Journal of synchrotron radiation     Volume:  16     ISSN:  1600-5775     ISO Abbreviation:  J Synchrotron Radiat     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-10-21     Completed Date:  2010-01-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9888878     Medline TA:  J Synchrotron Radiat     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  757-61     Citation Subset:  -    
Affiliation:
Geodynamics Research Center, Ehime University, Matsuyama, Japan. yunishi@sci.ehime-u.ac.jp
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