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

doi:10.1126/science.265.5176.1202

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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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-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 language	English
Pages (from-to)	1202-1203
Number of pages	2
Journal	Science
Volume	265
Issue number	5176
DOIs	https://doi.org/10.1126/science.265.5176.1202
Publication status	Published - 1994

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

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-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.",

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

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T1 - The phase boundary between α- and β-Mg2SiO 4 determined by in situ x-ray observation

AU - Morishima, H.

AU - Kato, T.

AU - Suto, M.

AU - Ohtani, E.

AU - Urakawa, S.

AU - Utsumi, W.

AU - Shimomura, O.

AU - Kikegawa, T.

PY - 1994

Y1 - 1994

N2 - 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.

AB - 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.

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JO - Science

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

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