Isometric section of the Co-Bi-Te system at 670/sup 0/Kstructural-analyses,

It is established that three solid solutions, based on CoTe/sub 2/ with bismuth contents up to approx. 25 at. %, are formed at a constant Co concentration, equal to 33.3 at. %. These three solid solutions are found to be in equilibrium with cobalt and all binary compounds of the Co-Bi-Te system. It is demonstrated that the Co-Bi/sub 2/Te/sub 3/ section is not quasibinary. Cobalt and binary compounds of the Co-Te and Bi-Te systems are found to be in equilibrium with the delta-solid solution. The difference between the alloys are related to changes in the unit-cell parameters of the solid solution with the alloy composition.