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The Coesite‐Stishovite Transition in a laser‐heated diamond cell
Author(s) -
Serghiou G.,
Zerr A.,
Chudinovskikh L.,
Boehler R.
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl02692
Subject(s) - stishovite , coesite , raman spectroscopy , phase transition , materials science , diamond anvil cell , phase boundary , diamond , atmospheric temperature range , phase (matter) , analytical chemistry (journal) , mineralogy , argon , thermodynamics , geology , high pressure , chemistry , atomic physics , quartz , optics , physics , composite material , eclogite , paleontology , organic chemistry , chromatography , subduction , tectonics
The coesite‐stishovite phase boundary in the temperature range 2300–2630°C was examined in a CO 2 ‐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 + 0.001T(°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.