Abstract
The classification of liquid alloys into two types, one appreciably more metallic in character than the other, is described in this paper. Attention is focussed on liquid MgBi, whose electronic properties may be followed continuously across the phase diagram, and which undergoes a transition from metallic to non-metallic behaviour near the composition Mg3 Bi2. New data for both the conductivity, σ, and the thermoelectric power, S, are presented. σ falls to a very low value (⋍ 45 Ω−1cm−1) at the composition Mg3Bi2 whilst dσ/dT is positive. S goes from positive to negative as the composition is changed from Mg3Bi2 + Bi toMg3Bi2 + Mg. Thus the electrical properties of this system closely resemble those previously found for liquid TeTl. A brief account of the data in terms of a model involving strongly energy dependent scattering is given.
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