V 86 Volkov, V. L. Electrical Conductivity of M2V12O30·nH2O (M = K, Rb, Cs) / V. L. Volkov, N. V. Podval'naya // Inorganic Materials. - 2004. - Vol. 40, № 11. - P. 1217-1220 : il. - Bibliogr. : p. 1220 (15 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ЭЛЕКТРОПРОВОДНОСТЬ -- ПОЛИВАНАДАТЫ Аннотация: The ac electrical conductivity of the M2V12O30·nH2O (M = K, Rb, Cs) polyvanadates prepared via hydrolytic precipitation is measured at 1 kHz between 298 and 423 K in air of 12% relative humidity. The 298-K conductivity of the samples is found to decrease with increasing cation size (in going from K to Rb and to Cs). The activation energy for conduction in the polyvanadates is 0.31–0.34 eV as determined during heating in the range 323–373 K and 0.20–0.23 eV above 373 K and during cooling. The activation energy is higher in Rb2V12O30· 6H2O. The 298-K ionic transference numbers inferred from dc conductivity measurements are 0.7,0.2, and 0.7 for K+, Rb+, and Cs+, respectively Полный текст |