Reactions between the three components Ag2O, V2O 5, and HF(aq) were investigated under hydrothermal conditions, and the recovered phases were, in increasing Ag:V content, Ag 2V4O11, β-AgV03, Ag4V 2O6F2, Ag4V2O 7, and α-Ag3-VO4. A higher ratio of Ag2O to V2O5, as compared to a stoichiometric ratio, was required to synthesize Ag4V2O6F 2, Ag4V2O7, and α-Ag 3VO4. Owing to their solubility differences, the crystallization regions are not centered around the respective 2:1 and 3:1 Ag2O/V2O5 tie-lines but rather are centered along the 4:1 and 8:1 Ag2O/V2O5 tie-lines. Reactions with a 4:1 Ag/V ratio either resulted in Ag4V 2O6F2 at 150 °C or Ag4V 2O7 at 200°C. Products were recovered in between 80% and 100% yield based on V2O5. Red transparent crystals of α-Ag3VO4 crystallize in the monoclinic space group C2/c, with cell parameters a = 10.1885(16) Å, b = 4.9751(8) A, c = 10.2014(17) Å, β = 115.754(3)°.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry