On the basis of analysis
of developing background and theory of thermoelectric graded materials,
p-type (Bi1-0.85Sb0.85)Te3 and PbTe two segments thermoelectrical graded materials
(TGM) with different barriers were fabricated by conventional hot-pressing
process. Metals Fe, Ni and Mg were used as barriers between two segments.
The thermoelectric properties were measured. The compositions of each
layer and composition distributions in and between different layers were
detected. It is demonstrated that better diffusion barriers materials
were metal Fe.