Wärmeleitfähigkeit und Thermokraft von ZnSb bei tiefen Temperaturen

Abstract

The authors have constructed a cryostat operated by vaporizing liquid helium to control temperatures between 4·2° and 300°K, to measure the thermal conductivity ϰ, the Seebeck coefficient α and the electrical conductivity σ as function of temperature T. The results for polycrystalline and monocrystalline ZnSb and for polycrystalline Zn_0·8Cd_0·2Sb are described and explained in terms of existent theories. Of special interest is the increase of ϰ with T in the room temperature range. Pure monocrystalline ZnSb shows an α maximum at low temperatures caused by phonon drag effect.