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- W1982592671 abstract "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." @default.
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- W1982592671 date "1978-10-01" @default.
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- W1982592671 title "High-pressure decomposition of Ca2GeO4 and Ca2MnO4 with the K2NiF4-type structures" @default.
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- W1982592671 doi "https://doi.org/10.1016/0031-9201(78)90034-1" @default.
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