Investigation of the conductivity of molten alkali and silver salts in the region between radio frequencies and the far-infrared

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Abstract
The dynamical conductivity sigma ( omega ) of molten NaNO2 and LiNO3 is measured near their melting points at frequencies between 0.5 MHz and 345 GHz (11.5 cm-1) joining the far-infrared. Dispersion is found only in the microwave range from which a relaxation time of about 5x10-12s is estimated for jump diffusion and is assumed to give the essential contribution to sigma . From reflection measurements the far-infrared conductivity of all alkali nitrates in the liquid state is evaluated. It can be satisfactorily described by an expression derived from an oscillator equation formulated with a memory function composed of two exponentials. The short-time behaviour is characterised by a frequency parameter which scales with the reduced mass of the ions, suggesting that nearly equal effective forces are operative. Additional measurements between 0.5 and 110 MHz on various other molten alkali and silver salts also show no dispersion of the conductivity in this range.

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