TRANSPORT-PROPERTIES OF BI-RICH BI-SB ALLOYS

This study is focused on the investigation of the transport properties of Bi-Sb alloys. Electrical resistivity, thermoelectric power and the rmal conductivity were measured in a direction perpendicular or parall el to the trigonal axis within the temperature range 4.2 - 300 K on va rious alloy compositions containing up to 18.2 at.% antimony. The temp erature dependences of the three coefficients are described in detail. Low temperature behaviour depends strongly on the crystal purity, par ticularly in the semiconducting range. A qualitative explanation of th ese results is given in terms of an impurity band which merges with th e conduction band. Thermoelectric properties are discussed and compare d with previous studies.