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- W1955791137 abstract "Abstract A review on the crystal chemistry of oxocobaltates of alkaline earth and rare earth metals is presented according to the formula of the compounds, based on increasing metal and oxygen content. The well‐known structures of perowskites and K 2 NiF 4 ‐type compounds and their higher homologues have been ignored and cross‐referred to older publications. Cobalt shows mainly the oxidation states Co 2+ and Co 3+ . In many cases it exhibits integer valences like Co 2.28+ , Co 2.5+ , Co 2.54+ , Co 2.8+ , Co 3.5 , and Co 3.6+ , referred in the ICSD database. The dominant coordination polyhedra are CoO 4 ‐tetrahedra and CoO 6 ‐oktahedra. In two cases a trigonal prismatic CoO 6 ‐coordination is observed. Composition, crystal structure, and oxidation state of cobalt often depend on the preparation conditions. In contrast to the alkaline oxides, the alkaline earth and rare earth oxides used for preparations are less reactive. Therefore the necessary reaction temperatures are much higher. In these cases single crystals for x‐ray investigation were prepared by plasma‐burner and CO 2 ‐LASER techniques." @default.
- W1955791137 created "2016-06-24" @default.
- W1955791137 creator A5062281129 @default.
- W1955791137 date "2013-06-27" @default.
- W1955791137 modified "2023-09-26" @default.
- W1955791137 title "On the Crystal Chemistry of Alkaline Earth- and Rare Earth-Oxocobaltates" @default.
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