Darstellung und Kristallstruktur von Silberorthogermanat, Ag4GeO4

Abstract

Abstract Ag4GeO4 was synthesized by solid state reaction of the binary components applying high oxygen pressure and water as an accelerating agent. Ag4GeO4 crystallizes triclinic (P[unk], Z = 4, a = 6.4099(8) Å, b = 8.5122(10) Å, c = 10.0891(14) Å, α = 106.91(1)°, β = 92.19(1)°, γ = 95.80(1)°, V = 522.66(12) Å3, conventional R = 8.29%). Crystals of Ag4GeO4 show systematic twinning with the twinning plane (014). The crystal structure of Ag4GeO4 consists of tetrahedral orthogermanate ions, which are surrounded by silver cations forming a cuboctahedron. All cations together (Ag+ and Ge4+) constitute a distorted ccp structure. The twinning of Ag4GeO4 is accountable to this cationic arrangement.