The polymorphism of silver tungstate Ag₂WO₄

Crystal data for α-, β- and γ-Ag₂WO₄ were collected from Cu Kα₁ powder diagrams, α-Ag₂WO₄ is orthorhombic (Pn2n) with a = 10.820(2), b = 12.018(2) and c = 5.900(1) Å. β-Ag₂WO₄ is hexagonal (P6₃ or P6₃/m) with a = 11.0925(3) and c = 7.5424(4) Å. γ-Ag₂WO₄ is cubic (Fd3m, spinel type) with a = 9.352(1) Å.