Abstract: | Oxocobaltates of Alkali Metals. On Li8CoO6. Hitherto unknown Li8CoO6, rubin- red single crystals, cristallizes according to WEISSENBERG and precession photographs (MoKα) hexagonal with a = 5.44 Å, c = 10.87 Å; c/a = 2.0; Z = 2, space group C ? P63cm. Atomic parameters see text. The structure derives from a closest packing of O2?, ABACA … (The tetrahedral, ?isolated”? groups CoO4] show remarkable short distances Co–O (1.66 Å), comparable with CoO4] in Li4CoO4, being isotypic with Li4SiO4. The MADELUNG Part of Lattice Energy is calculated and discussed. |