Affiliation:
1. Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences
Abstract
Cesium-containing compounds of hydrated vanadium(V) oxide of general formula СsxV2O5·nH2O, where 0.1 ≤ x ≤ 0.6 and 0.8 ≤ n ≤ 1.2, were prepared by hydrothermal, hydrolytic, and sol–gel processes. The preparation conditions were found to determine the intercalated cation (Cs+) homogeneity range and the vanadium(IV) percentage in the samples. The prepared compounds were characterized by a set of physicochemical methods, namely, IR spectroscopy, X-ray powder diffraction, thermogravimetric analysis, scanning electron microscopy, and low-temperature nitrogen adsorption. The СsxV2O5·nH2O compounds prepared by the hydrolytic and hydrothermal methods had the highest specific surface area, equal to 34.0 and 16.5 m2/g, respectively. The temperature-dependent electrical conductivities of СsxV2O5·nH2O samples were measured to estimate the activation energy of conduction in compounds having various vanadium(IV) percentages. It is only in the high-temperature range that the activation energy of conduction depended on the V4+ percentage in the sample; the least value was found in the hydrothermally prepared Сs0.6V2O5·H2O samples.
Publisher
The Russian Academy of Sciences