The coesite-stishovite transition in a laser-heated diamond cell

Details The coesite-stishovite transition in a laser-heated diamond cell The coesite-stishovite transition in a laser-heated diamond cell

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..441s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 4, p. 441-444

Physics

17

Cells, Coesite, Diamonds, Laser Heating, Phase Transformations, Raman Spectra, Spectroscopic Analysis, Stishovite, Carbon Dioxide Lasers, Raman Spectroscopy

Scientific paper

The coesite-stishovite phase boundary in the temperature range 2300-2630 C was examined in a CO2-laser heated diamond anvil cell using argon as a pressure medium. Phase identification was provided by Raman spectroscopy of the temperature quenched samples at pressure. Our results suggest a coesite-stishovite phase boundary curve described by P(GPa) = 8.1+0.001 T (C) in good agreement with Yagi and Akimoto's (1976) estimate at lower temperatures. The slope of this curve is less than one half that determined recently by Zhang et al. (1993, 1994) in a multi-anvil press.

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