LATTICE-PARAMETER AND ELECTRONIC-PROPERTIES OF THE SOLID-SOLUTION COSB2-COTE2

The lattice parameter, the magnetic susceptibility, and the thermoelec tric power of the marcasite-type solid solution in the system cobalt-a ntimony-tellurium are reported. Systematic changes are observed if tel lurium is successively replaced by antimony. The peculiar variations o f the unit cell dimensions with composition are found to be correlated with some characteristic changes in the electronic properties. The ma gnetic behaviour varies in a systematic manner from paramagnetic on th e tellurium-rich side to diamagnetic on the antimony rich side. The th ermoelectric power adopts negative values of about -20 mu V K-1 on the tellurium-rich side, increases in magnitude on the antimony-rich side of the solid solution, and abruptly changes its sign in the vicinity of CoSb2. The trends in the properties are discussed in terms of a sch ematic band model and the structural changes occurring in the system.