The phase boundary between α- and β-Mg2SiO4 determined by in situ X-ray observations

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

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Abstract

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

Original languageEnglish
Pages (from-to)1202-1203
Number of pages2
JournalScience
Volume265
Issue number5176
Publication statusPublished - 1994

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overpressure
anvils
synchrotron radiation
Earth mantle
x rays
diamonds
temperature
kinetics

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Morishima, H., Kato, T., Suto, M., Ohtani, E., Urakawa, S., Utsumi, W., ... Kikegawa, T. (1994). The phase boundary between α- and β-Mg2SiO4 determined by in situ X-ray observations. Science, 265(5176), 1202-1203.

The phase boundary between α- and β-Mg2SiO4 determined by in situ X-ray observations. / Morishima, H.; Kato, T.; Suto, M.; Ohtani, E.; Urakawa, Satoru; Utsumi, W.; Shimomura, O.; Kikegawa, T.

In: Science, Vol. 265, No. 5176, 1994, p. 1202-1203.

Research output: Contribution to journalArticle

Morishima, H, Kato, T, Suto, M, Ohtani, E, Urakawa, S, Utsumi, W, Shimomura, O & Kikegawa, T 1994, 'The phase boundary between α- and β-Mg2SiO4 determined by in situ X-ray observations', Science, vol. 265, no. 5176, pp. 1202-1203.
Morishima H, Kato T, Suto M, Ohtani E, Urakawa S, Utsumi W et al. The phase boundary between α- and β-Mg2SiO4 determined by in situ X-ray observations. Science. 1994;265(5176):1202-1203.
Morishima, H. ; Kato, T. ; Suto, M. ; Ohtani, E. ; Urakawa, Satoru ; Utsumi, W. ; Shimomura, O. ; Kikegawa, T. / The phase boundary between α- and β-Mg2SiO4 determined by in situ X-ray observations. In: Science. 1994 ; Vol. 265, No. 5176. pp. 1202-1203.
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AU - Kato, T.

AU - Suto, M.

AU - Ohtani, E.

AU - Urakawa, Satoru

AU - Utsumi, W.

AU - Shimomura, O.

AU - Kikegawa, T.

PY - 1994

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