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Thermal expansivity of MgSiO 3 perovskite under high pressures up to 20 GPa
Author(s) -
Utsumi Wataru,
Funamori Nobumasa,
Yagi Takehiko,
Ito Eiji,
Kikegawa Takumi,
Shimomura Osamu
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl00584
Subject(s) - diamond anvil cell , synchrotron radiation , volume (thermodynamics) , perovskite (structure) , mineralogy , geology , diffraction , materials science , thermal expansion , synchrotron , thermodynamics , high pressure , analytical chemistry (journal) , crystallography , chemistry , optics , physics , composite material , chromatography
Volume measurement of MgSiO 3 perovskite was made in the temperature range from 25 to 500°C as a function of pressure up to 20 GPa by in situ x‐ray diffraction, using a DIA apparatus combined with synchrotron radiation. The measured thermal expansivity ranges from 1.8 to 2.5*10 −5 /K and decreases only slightly with pressure. Our present results are in good agreement with the previous lower pressure (up to 11 GPa) data of Wang et al. [1994] and the higher pressure (36 GPa) data of Funamori and Yagi [1993], but contrast with the results using diamond anvil cell by Mao et al. [1991], particularly in a low pressure range.