Open AccessP ‐ V ‐ T equation of state of MgSiO 3 perovskite based on the MgO pressure scale: A comprehensive reference for mineralogy of the lower mantle
Author(s) -
Tange Yoshinori,
Kuwayama Yasuhiro,
Irifune Tetsuo,
Funakoshi Kenichi,
Ohishi Yasuo
Publication year - 2012
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2011jb008988
Subject(s) - silicate perovskite , diamond anvil cell , equation of state , thermodynamics , perovskite (structure) , materials science , mineralogy , post perovskite , mantle (geology) , analytical chemistry (journal) , geology , high pressure , crystallography , chemistry , physics , geophysics , chromatography
In situ P ‐ V ‐ T measurements of MgSiO 3 perovskite were carried out up to 110 GPa and 2500 K, using a sintered‐diamond multianvil apparatus and a laser‐heated diamond anvil cell together with synchrotron radiation. The P ‐ V ‐ T data sets obtained by multianvil experiments (28–63 GPa and 300–1500 K) and diamond anvil cell experiments (52–108 GPa and 300, 1500–2430 K) are consistent with each other. The equation of state of MgSiO 3 perovskite was subsequently represented by a Mie‐Grüneisen‐Debye model, using the equation of state of MgO as reference for pressure determination. In this study, we provide mutually consistent and precise P ‐ V ‐ T equations of state of MgSiO 3 perovskite and MgO applicable to the bottom of the Earth's lower mantle. These P ‐ V ‐ T equations of state and derivative thermodynamic and elastic properties are essential for mineralogy of the lower mantle as a comprehensive reference.