1984 Volume 57 Issue 6 Pages 1478-1482
Potassium vanadates, which were prepared from melts by rapid quenching and slow cooling over the composition range of K2O-contents of C=(K)/(V)=0–0.50, were examined by means of IR spectrometry and X-ray powder diffraction. In the composition range of C≤0.17, mixtures of V2O5, K2V18O45, and K2V8O21 were produced by the slow cooling. At the composition of C=0.33, however, an unknown compound and K2V8O21 were the main products upon rapid quenching from melts, while at C=0.50 the main products were K3V5O14 and an additional unknown compound. The unknown compound was confirmed to be metastable and was formed as a single compound only by a rapid quenching from melts of K2O and V2O5 especially at C=0.37. The X-ray diffractions for the compound were characterized as d=8.2 (very strong), 4.05, and 3.27 Å, and the V=O stretching frequencies, as 995, 968, and 955 cm−1. By comparing these characteristic data with those of lithium trivanadate and sodium trivanadate (γ-phase), it was suggested that the unknown compound was isomorphous with trivanadate (M1+xV3O8).
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