The high-pressure and temperature equation of state of a majorite solid solution in the system of Mg4Si4O12-Mg3Al2Si3O12 |
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| Authors: | H Morishima E Ohtani T Kato T Kubo A Suzuki T Kikegawa O Shimomura |
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| Institution: | (1) Institute of Mineralogy, Petrology, and Economic Geology, Tohoku University, Sendai, Japan e-mail: ohtani@mail.cc.tohoku.ac.jp Fax: +81-22-2176675, JP;(2) Photon Factory, National Laboratory for High Energy Physics, Tsukuba, Japan, JP |
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| Abstract: | The high-pressure and temperature equation of state of majorite solid solution, Mj0.8Py0.2, was determined up to 23 GPa and 773 K with energy-dispersive synchrotron X-ray diffraction at high pressure and high temperature
using the single- and double-stage configurations of the multianvil apparatuses, MAX80 and 90. The X-ray diffraction data
of the majorite sample were analyzed using the WPPD (whole-powder-pattern decomposition) method to obtain the lattice parameters. A least-squares fitting using the third-order Birch-Murnaghan equation
of state yields the isothermal bulk modulus, K
T0
= 156 GPa, its pressure derivative, K′ = 4.4(±0.3), and temperature derivative (∂K
T
/∂T)
P
= −1.9(±0.3)× 10−2 GPa/K, assuming that the thermal expansion coefficient is similar to that of pyrope-almandine solid solution.
Received: 5 October 1998 / Revised, accepted: 24 June 1999 |
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| Keywords: | Majorite garnet X-ray diffraction PVT observation |
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