## Abstract

The high-pressure and temperature equation of state of majorite solid solution, Mj_{0.8}Py_{0.2}, 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(TO) = 156 GPa, its pressure derivative, K' = 4.4(±0.3), and temperature derivative (partial differential K(T)/ partial differential T)(P) = -1.9(±0.3) x 10^{-2} GPa/K, assuming that the thermal expansion coefficient is similar to that of pyrope-almandine solid solution.

Original language | English |
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Pages (from-to) | 3-10 |

Number of pages | 8 |

Journal | Physics and Chemistry of Minerals |

Volume | 27 |

Issue number | 1 |

DOIs | |

Publication status | Published - Nov 1999 |

Externally published | Yes |

## All Science Journal Classification (ASJC) codes

- General Materials Science
- Geochemistry and Petrology

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_{4}O

_{12}-Mg

_{3}Al

_{2}Si

_{3}O

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