Phase boundary between alpha- and beta-Mg2SiO4 determined by in situ X-ray observation

Details Phase boundary between alpha- and beta-Mg2SiO4 determined by in situ X-ray observation Phase boundary between alpha- and beta-Mg2SiO4 determined by in situ X-ray observation

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994sci...265.1202m&link_type=abstract

Science (ISSN 0036-8075), vol. 265, no. 5176, p. 1202-1203

Mathematics

82

Forsterite, High Pressure, High Temperature, Phase Diagrams, Phase Stability (Materials), Pressure Dependence, Temperature Dependence, Earth Mantle, Mathematical Models, Phase Transformations, X Ray Analysis, X Ray Diffraction

Scientific paper

The stability of Mg2SiO4, a major constituent in the earth's mantle, has been investigated experimentally by in situ observation with synchrotron radiation. A cubic-type high-pressure apparatus equipped with sintered diamond anvils has been used over pressures of 11 to 15 gigapascals and temperatures of 800 to 1600 C. The phase stability of alpha-Mg2SiO4 and beta-Mg2SiO4 was determined by taking account of the kinetic behavior of transition. The phase boundary between alpha-Mg2SiO4 and beta-Mg2SiO4 is approximated by the linear expression P = (9.3 +/- 0.1) + (0.0036 +/- 0.0002)T, where P is pressure in gigapascals and T is temperature in degrees Celsius.

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