具有不同扩散势垒的p型(Bi1-0.85Sb0.85)和PbTe二元梯度热电材料的研制

摘要

在分析了热电材料的发展背景和研究理论的基础rn上，采用热压法制备出单体和双层具有不同扩散势垒的 (Bi)1-0.850.8)与PbTe体系二元rn梯度热电材料．金属，Fe, Ni 和 Mg被用作层间扩散势垒材料．测定了它们的热rn电性能，分析了它们的物质组成和各层内和层间的成分分布，确定出较好的扩散rn势垒材料为金属铁和钴%On the basis of analysis rnof developing background and theory of thermoelectric graded materials,rn p-type (Bi1-0.85Sb0.85)Te3 and PbTe two segments thermoelectrical graded materials rn(TGM) with different barriers were fabricated by conventional hot-pressing rnprocess. Metals Fe, Ni and Mg were used as barriers between two segments.rn The thermoelectric properties were measured. The compositions of each rnlayer and composition distributions in and between different layers were rndetected. It is demonstrated that better diffusion barriers materials rnwere metal Fe.