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High‐pressure stability and thermodynamic properties of CoSiO 3
Author(s) -
Bohlen Steven R.,
Boettcher A. L.
Publication year - 1981
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/gl008i006p00575
Subject(s) - instability , piston (optics) , thermodynamics , phase (matter) , chemical stability , stability (learning theory) , high pressure , materials science , chemistry , physics , mechanics , optics , wavefront , machine learning , computer science , organic chemistry
We determined the stability of CoSiO 3 relative to Co 2 SiO 4 +SiO 2 with reversed experiments in a piston‐cylinder apparatus. Our data at 1023, 1173, 1323, and 1473 K indicate instability of CoSiO 3 below 17.2, 18.0, 19.1, and 20.4 Kbars. ΔG 298 ° and ΔH 298 ° (from oxides) calculated from our data between 900 and 1500 K are −12.5±0.2 kJ and −8.0±0.2 kJ, respectively. The dP/dT slopes of phase transformations in Fe‐bearing systems in planetary interiors that are inferred from Co analogues may be incorrect.