Internal Mobilities in (Na-Rb)NO3 Melts

Isao Okada 1 , Ryuzo Takagi 1 ,  und Kazutaka Kawamura 2
  • 1 Department of Electronic Chemistry, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama, Japan
  • 2 Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, Japan

Internal mobility ratios in melts of the system (Na-Rb)NO3 have been measured with the Klemm method at various temperatures and compositions. The internal mobilities have been calculated from these and the available data on densities and conductivities. The Chemla effect has been observed. For NaNO3 concentrations > 10 mol %, the internal mobility of the Na+ ions obeys the formula bNa = [A/(V - V0)] exp(- E/RT). where V is the molar volume and V° is slightly temperature dependent. For NaNO3 concentrations < 10 mol %, bNa becomes smaller than expected from the formula. The internal mobility of the Rb+ ions also obeys such a formula at higher temperatures. At lower temperatures it in, like that of the Cs+ ions, a function of the mole fraction and independent of the kind of coions

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