Abstract
The dependence of the ionic conductivity of СuСrS2, АgСrS2 compounds and their alloys on temperature is measured. Structural studied carried out earlier showed that the CuxAg1-xCrS2 alloys exist as a mixture of СuСrS2 and АgСrS2 phases at temperatures below 673 K and as a solid solution on the basis of a matrix structure at temperatures above 673 K. It is established that for all systems the activation energy for ionic conductivity has a jump at the phase transition point, which corresponds to the temperature of complete disordering of monovalent ionic sublattices. Chemical diffusion coefficients and ionic transport numbers for all tested compounds were determined from the build-up and decay curves of concentration polarization.
References (7)
1. Bongers P.F., van Bruggen C.F., Koopstra J., OmlooW.P.F.A.M., Wiegers G.A., Jellinek F. Structures andmagnetic properties of some metal (I) chromium (III)sulphides and selenides. J. Phys. Chem. Solids., 1968, V.29, № 6, P. 977-984.
2. Nagard N.Le., Collin G., Gorochov O. Etude structural etproperties physiques CuCrS2. Mat. Res. Bull., 1979, V. 14, № 11, P. 1411-1417.
3. Engelsman F.M.R., Wiegers G.A., Jellinek F., van Laar B.Crystal structures and magnetic structures of some metal(I) chromium (III) sulphides and selenides. J. Solid StateChem., 1973, V. 6, № 4, P. 574-582.
4. Васильева И.Г., Кардаш Т.Ю., Малахов В.В. Фазовыепревращения СuСrS2: структурное и химическое ис-следование. Журнал структурной химии, 2009, Т. 50, № 2, С.302-310.
5. Tewari G.C., Tripathi T.S., Rastogi A.K. ThermoelectricProperties of Layer-Antiferromagnet СuСrS2. J. ElectronicMat., 2010, V. 39, P. 1133-1139.
6. Chen Y.X., Zhang B.P., Ge Z.H., Shang P.P. Preparation andthermoelectric properties of ternary superionic conductorСuСrS2. J. Solid State Chem., 2012, V. 186, P. 109-115.
7. Jokota J. On the theory of mixed conduction with specialreverence to the conduction in silver sulfide group semiconductors.J. Phys. Soc. Japan, 1961, V. 16, № 11, P. 2213-2223.