The phase boundary between α- and β-Mg2SiO 4 determined by in situ x-ray observation

H. Morishima, T. Kato, M. Suto, E. Ohtani, S. Urakawa, W. Utsumi, O. Shimomura, T. Kikegawa

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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 α-Mg 2SiO4 and β-Mg2SiO4 was determined by taking account of the kinetic behavior of transition. The phase boundary between α-Mg2SiO4 and β-Mg 2SiO4 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.

Original languageEnglish
Pages (from-to)1202-1203
Number of pages2
Issue number5176
Publication statusPublished - 1994

ASJC Scopus subject areas

  • General


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