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Equation of state of CaSiO 3 perovskite to 96 GPa
Author(s) -
Tarrida Martine,
Richet Pascal
Publication year - 1989
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/gl016i011p01351
Subject(s) - perovskite (structure) , equation of state , materials science , bulk modulus , mineralogy , solubility , diamond anvil cell , analytical chemistry (journal) , thermodynamics , geology , high pressure , crystallography , physics , chemistry , composite material , chromatography
The CaSiO 3 perovskite has been synthesized in a laser‐heated diamond‐anvil cell at initial pressures ranging from 15 to 85 GPa. Chemical microanalyses of the quenched product show negligible solubility in the CaSiO 3 perovskite of aluminum from the ruby added for pressure measurements. The compression of CaSiO 3 perovskite has been measured to 96 GPa with X‐ray methods. The results do not show a significant deviation of K o ′ from 4, and with a Birch‐Murnaghan equation of state we obtain a 1‐bar molar volume V o = 45.60 ± 0.10 ų and a bulk modulus K o = 275 ± 15 GPa. This perovskite may be an "invisible" component of the lower mantle in view of the similarity of its density with that given by the standard Earth model, PREM.