THERMAL AND ELECTRICAL-PROPERTIES OF THE GE-SB-TE SYSTEM BY PHOTOACOUSTIC AND HALL MEASUREMENTS

The thermal and electrical properties in the (Ge:Sb:Te) system have be en determined using photoacoustic and Hall measurements, respectively. The thermal diffusivity, thermal conductivity, hole concentration, an d Hall mobility are analyzed as a function of the tellurium concentrat ion in the bulk alloys. It is found that both the thermal and electric al parameters depend strongly on the alloy composition and on the crys talline structure of the solid compound. The thermal and electrical me asured parameters correlate well with the density of holes arising fro m Ge and/or Sb vacancies.