Static compression of the hydrous magnesium silicate phase D to 30 GPa at room temperature |
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Authors: | D J Frost Y Fei |
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Institution: | Bayerisches Geoinstitut, Universit?t Bayreuth, D-95440 Bayreuth, Germany e-mail: dan.frost@uni-bayreuth.de Fax: +49-921-553769, DE Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, D.C., 20015–1305, USA, US
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Abstract: | Phase D is a dense hydrous magnesium silicate (ideal formula MgSi2H2O6) which contains silicon cations exclusively in octahedral coordination. Measurements of the unit cell parameters of phase
D were made to pressures of 30 GPa using a diamond anvil cell and employing synchrotron X-ray diffraction. A neon pressure
medium was used. Using a third order Birch-Murnaghan equation of state the isothermal bulk modulus of phase D was determined
as 166(±3) GPa with K′ equal to 4.1(±0.3). The compression of phase D is anisotropic with the c-axis twice as compressible as the a-axis. Above 20 GPa, however, the c/a ratio becomes pressure independent.
Received: 29 July 1998/ Revised, accepted: 5 August 1998 |
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Keywords: | Phase D Bulk modulus Diamond anvil High pressure |
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