Synthese und Struktur eines Hochtemperatur-Cobaltarsenats(V): H?Co3(AsO4)2

Synthesis and Structure of a High Temperature Cobaltarsenate: H? Co₃(AsO₄)₂ Single crystals of the high temperature compound H? Co₃(AsO₄)₄ were prepared at 1800°C with a CO₂-Laser technique. X-ray single crystal work shows monoclinic symmetry (space group C-P2₁/c; a = 6.457, b = 8.510, c = 11.187 Å; ß = 90.73°). In opposition to monoclinic m-CO₃(AsO₄)₂ H? Co₃(AsO₄)₂ has a different coordination of Co²⁺ including a different connection of the distorted polyhedra. There exists a significant similarity to Cu₃(AsO₄)₂.