The temperature-pressure-volume equation of state of .GAMMA.-Mg2SiO4
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Accession number;04A0674188
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| Title;The temperature-pressure-volume equation of state of .GAMMA.-Mg2SiO4 |
| Author;
MATSUI M
(Univ. Hyogo, Hyogo, Jpn)
KATSURA T
(Okayama Univ., Tottori, Jpn)
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Journal Title;J Mineral Petrol Sci
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Journal Code:G0150B
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ISSN:1345-6296
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VOL.99;NO.2;PAGE.72-75(2004)
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| Figure&Table&Reference;FIG.1, TBL.2, REF.20 |
| Pub. Country;Japan |
| Language;English |
| Abstract;Based on breathing-shell-model MD simulations with quantum correction, we calculated the temperature-pressure-volume (T-P-V) equation of state (EOS) of .GAMMA.-Mg2SiO4 to be used as a reliable pressure calibration standard at temperatures up to 2000K and pressures up to 25-30GPa. The simulations use empirical interionic potentials, previously developed for the Mg2SiO4 system to reproduce accurately measured structural and elastic properties. The potentials are applicable not only to .GAMMA.-Mg2SiO4, but also to .ALPHA.- and .BETA.-Mg2SiO4 over wide temperature and pressure ranges. We assessed the accuracy of the resulting T-P-V EOS of .GAMMA.-Mg2SiO4, by using the recently reported data on simultaneous X-ray measurements of MgO and .GAMMA.-Mg2SiO4, performed by using synchrotron radiation in a multi-anvil apparatus at high temperatures and pressures. We found that pressures estimated through the MgO EOS presented by Matsui et al. (2000) and those for the .GAMMA.-Mg2SiO4EOS agree very well, with the average differences in the estimated pressures between the two EOS's less than 0.3GPa at T between 1500 and 2000K and P between 19 and 23GPa. (author abst.) |
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