Physics
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pepi...17p..29l&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 17, Issue 3, p. p29-p33.
Physics
1
Scientific paper
By using the diamond-anvil pressure cell coupled with laser heating, Ca2GeO4 in the K2NiF4-type structure has been found to decompose into the mixture Ca3Ge2O7 plus CaO at pressures greater than 200 kbar and at about 1000°C, and the same type of structure for Ca2MnO4 has been found to decompose into the mixture CaMnO3 (perovskite) plus CaO at pressures greater than 100 kbar and at about 1400°C. The decomposition product of Ca3Ge2O7 is a new compound which is isostructural with Sr3Ti2O7 and has the lattice parameters of a = 3.72 +/- 0.01 and c = 19.32 +/- 0.05 Å at room temperature and 1 bar pressure. The results of the study of Ca2GeO4 and Ca2MnO4 (both with the K2NiF4-type structure) strongly support the view that compounds possessing the K2NiF4-type structure are unstable relative to corresponding mixtures possessing the perovskite and rocksalt structures. It is concluded that, in the earth's mantle, the K2NiF4-type Ca2SiO4 would ultimately decompose into the mixture CaSiO3 (perovskite) + CaO or would otherwise transform to other as-yet-unknown phase(s), and that the mixture of MgSiO3 (perovskite) + MgO (the post-spinel phase of Mg2SiO4) would not adopt the K2NiF4-type structure.
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