High-pressure decompositions in cobalt and nickel silicates

Details High-pressure decompositions in cobalt and nickel silicates High-pressure decompositions in cobalt and nickel silicates

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pepi...10...88i&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 10, Issue 1, p. 88-93.

Physics

4

Scientific paper

High-pressure stability relations in cobalt and nickel silicates have been studied over the pressure range 130-330 kbar employing a double-staged split-sphere-type high-pressure apparatus. γ-Co2SiO4 and γ-Ni2SiO4 decompose directly into their constituent oxide mixtures (rocksalt plus stishovite) 175 kbar and 280 kbar, respectively. The result that γ-Ni2SiO4 has a wider stability field in pressure than γ-Co2SiO4, is consistent with simple crystal-field theory. The experimental precision is high enough to show that the decomposition boundary of γ-Co2SiO4 has a positive slope (dP/dT > 0) and a preliminary determination of the boundary curve is P(kbar) = 0.065 T (°C) + 110. No positive evidence for the existence of high-pressure forms of CoSiO3 and NiSiO3 has been obtained in these quenching experiments, and they finally decompose into constituent oxide mixtures as in the cases of orthosilicates.

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