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In situ measurements of the majorite‐akimotoite‐perovskite phase transition boundaries in MgSiO 3
Author(s) -
Hirose Kei,
Komabayashi Tetsuya,
Murakami Motohiko,
Funakoshi Kenichi
Publication year - 2001
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 - 10.1029/2001gl013549
Subject(s) - perovskite (structure) , ilmenite , triple point , phase boundary , phase transition , thermodynamics , mineralogy , geology , materials science , analytical chemistry (journal) , phase (matter) , crystallography , chemistry , physics , organic chemistry , chromatography
Here we report the phase boundaries between majorite, akimotoite (ilmenite), and perovskite in MgSiO 3 determined by in situ measurements in a multi‐anvil apparatus. We used both gold and platinum as internal pressure standards at high pressure and temperature. Our results obtained at 1400‐2000°C, together with previous results obtained at 1000‐1200°C by Ono et al. [2001], precisely locate the akimotoite‐perovskite transition boundary at P (GPa) = 25.09 ‐ 0.0027 × T (°C), based on the P‐V‐T equation of state of gold [ Anderson et al., 1989]. Our new experimental data show the position of triple point to be 20.0 GPa and 1920°C. The present measurements reconfirm our earlier study [ Hirose et al., 2001] that Anderson's gold pressure scale gives slightly higher pressures than the platinum pressure scale proposed either by Jamieson et al. [1982] or Holmes et al. [1989].