Temperature-time dependences of the electrical conductivity of metal-ammonia solutions in the solid phase

The electrical conductivity of quenched sodium-ammonia solutions with the metal concentration ranging from 1 to 16 at.% was studied as a function of time and of the temperature over the 20–195°K range. Results of x-ray analysis are shown here which cover the 3–16 at.% range of sodium concentration and the 77–170°K temperature range. It is demonstrated that the high electrical conductivity of freshly quenched sodium-ammonia solutions is due to the precipitation, during freezing, of domains with a higher sodium concentration so that high-conductance channels are formed in the solution. The increase in the electrical resistance with time and with increasing temperature is attributed here to the diffusion processes which coagulate the metal into colloidal particles.

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