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Science 26 August 1994:
Vol. 265. no. 5176, pp. 1202 - 1203
DOI: 10.1126/science.265.5176.1202
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Articles

The Phase Boundary Between agr- and beta-Mg2SiO4 Determined by in Situ X-ray Observation

H. Morishima 1, T. Kato 1, M. Suto 1, E. Ohtani 1, S. Urakawa 2, W. Utsumi 3, O. Shimomura 4, and T. Kikegawa 4

1 Earth and Planetary Material Sciences, Faculty of Science, Tohoku University, Sendai 980, Japan
2 Faculty of Science, Okayama University, Okayama 700, Japan
3 Institute for Solid State Physics, University of Tokyo, Tokyo 106, Japan
4 Photon Factory, National Laboratory for High Energy Physics, Tsukuba 305, Japan

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 agr-Mg2SiO4 and beta-Mg2SiO4 was determined by taking account of the kinetic behavior of transition. The phase boundary between agr-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.

Submitted on February 8, 1994
Accepted on July 11, 1994


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