INTERNAL MOBILITIES IN THE MOLTEN BINARY-SYSTEMS (TL, K)NO3 AND (TL, CS)NO3

Ratios of internal cation mobilities in the molten binary systems (Tl, K)NO3 and (Tl, Cs)NO3 have been measured by the Klemm method. From th ese and the data available on the densities and electric conductivitie s, the internal mobilities b have been calculated. While generally in the mixtures of TlNO3 with alkali nitrates at constant temperature the conductivities and internal mobilities decrease with increasing molar volume, in (Tl, K)NO3 they decrease with decreasing molar volume. Thi s is explained by the high polarizability of the Tl+ ions.