Thermoelectric powers of liquid K-Hg, K-T1, and K-Pb alloys

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Abstract
Thermoelectric powers of liquid K-Hg alloys were measured over the whole concentration range from about 100° to 360°C. The observed data indicate a strong minimum at 7 at. % potassium, whose depth is deeper on increasing temperature. Measurements were also made on liquid K-based alloys containing Tl and Pb, respectively, from about 100° to 260°C. Thermoelectric powers of the K-rich alloys decrease linearly with temperature, and increase non-linearly with solute concentration. These experimental results are compared with the calculated values due to the Faber-Ziman theory, in which the Ashcroft pseudopotential and the structure factors of a mixture of rigid spheres are used. The theoretical prediction is good for the K-rich alloys but is unsuccessful in the Hg-rich region of the K-Hg alloys. A brief discussion is finally given for the density of electron states of liquid Hg and its alloys.