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Robert E. Dinnebier, Anton Kowalevsky, Harald Reichert, Martin Jansen
Polymorphism of Ag3VO4
Keywords: Ternary silver oxovanadates, Polymorphism, Powder diffraction structure analysis, X-ray diffraction
The polymorphism of Ag3VO4 was investigated with temperature dependent synchrotron powder diffraction, and differential scanning calorimetry in the temperature range 295 K ≤ T ≤ 893 K. Three crystal structures of Ag3VO4 were identified and determined from powder diffraction data: α-Ag3VO4 (T = 295 K, C2/c, a = 10.2672(2) Å, b = 4.9814(1) Å, c = 10.2240(2) Å, β = 116.0(1)°, V = 470.0(2) Å3), β-Ag3VO4 (T = 423 K, I-42m, a = 4.9968(1) Å, c = 9.6911(3) Å, V = 241.97(1) Å3), and γ-Ag3VO4 (T = 703 K, Fm-3m, a = 7.8386(1) Å, V = 481.62(1) Å3). The crystal structures of all three phases of Ag3VO4 can be described as cubic closed packed arrangements of [VO4]3– anions with the silver cations occupying all octahedral and tetrahedral voids.
Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag
Print ISSN: 0044-2968
Volume: 222, 08/2007
Pages: 420 - 426