Micro Wien effect

The role played by the micro Wien effect in dissociating the disodium spinide with increasing concentration beyond the conductance minimum is strongly indicated by the temperature coefficient of the conductance of solutions of sodium and potassium in liquid ammonia. Here we have data for the temperature coefficient of sodium and potassium from relatively dilute solutions up to saturation. 

The fluidity of ammonia increases about 1.5% per degree, and in the dilute range the temperature coefficient of metal solutions is of this order of magnitude but from a concentration of approximately 0.9AT onward the temperature coefficient of sodium and potassium begins to increase, reaching a maximum of about 3.6% for sodium and 4.6% for potassium. The conductance increase owing to temperature increase can only be caused by an increased dissociation of sodium spinide. It follows that the conductance increase with increasing concentration of sodium solutions is to be expected and conforms with the assumptions of a micro Wien effect. 

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