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- W2079779968 abstract "The K2NiF4-type phase in the La-Co-O system has been studied and vacancy formation on both the lanthanum and oxygen sublattices has been observed. The formula La2CoO4 has generally been accepted for the K2NiF4-type phase in the La-Co-O system. However, a broad range of lattice constants are reported for this material, indicative of variations in composition. More recently, a range of stoichiometries has been suggested in the literature which is represented by the formula La2CoO4+x. The variations in stoichiometry have previously been explained by the presence of excess oxygen or by inter-growths of Ruddlesden-Popper-type phases, (AO(ABO3)n). In this work, X-ray diffraction data confirmed the previous variations in lattice parameters but indicated that the material is lanthanum deficient, not rich in oxygen. Thermogravimetric analysis confirmed the existence of variable oxygen stoichiometry. These data were consistent with a range of compositions described by the general formula La1.83CoO4-x, where 0 ≤x≤ 0.13. These materials contain a maximum of 50% trivalent cobalt when x= 0. In addition, thermo-gravimetric experiments in lower partial pressures of oxygen have enabled us to isolate a new, fully reduced form, La1.83CoO3.75, which contains only divalent cobalt. A two- phase region exists between La1.83CoO3.75 and La1.83CoO3.87." @default.
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- W2079779968 date "1986-09-01" @default.
- W2079779968 modified "2023-09-27" @default.
- W2079779968 title "Nonstoichiometric K2NiF4-Type Phases in the Lanthanum-Cobalt-Oxygen System" @default.
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- W2079779968 doi "https://doi.org/10.1111/j.1151-2916.1986.tb07474.x" @default.
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