Disproportionation of marokite at high pressures and temperatures with geophysical implications

Details Disproportionation of marokite at high pressures and temperatures with geophysical implications Disproportionation of marokite at high pressures and temperatures with geophysical implications

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..64..139l&link_type=abstract

Earth and Planetary Science Letters, Volume 64, Issue 1, p. 139-144.

Computer Science

Scientific paper

Natural marokite (CaMn2O4) has been studied at high pressures and temperatures using a diamond-anvil press coupled with laser heating in the pressure range 100-250 kbar. A mixture of marokite, CaMnO3 (perovskite) and MnO (rocksalt) has been observed in all runs in the above pressure range by X-ray diffraction study of the quenched samples. It was interpreted that marokite disproportionates into the mixture CaMnO3 (perovskite) + MnO (rocksalt) at pressures below 100 kbar. A general comparison of the molar volume for all known compounds having the marokite-related structures (including CaFe2O4 and CaTi2O4) with those for a mixture of perovskite plus rocksalt structures suggested that the mixture is more stable than the marokite-related structures at high pressures, as confirmed by the present experimental result. The CaFe2O4-modification of common nepheline (NaAlSiO4) is also suggested to be unstable relative to the component oxides of α-NaAlO2 + SiO2 (stishovite) at high pressures.

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