A HIGH FIGURE OF MERIT P-TYPE FeNbTiSb THERMOELECTRIC MATERIAL AND THE PREPARATION METHOD THEREOF

摘要

The present invention discloses a type of high figure of merit p-type FeNbTiSb thermoelectric material, whose composition is FeNb1-xTixSb, wherein x=0.06˜0.24. The present invention also discloses the method to prepare these p-type FeNbTiSb thermoelectric materials. The ingots with nominal composition FeNb1-xTixSb are prepared by levitation melting of stoichiometric amounts of Fe, Nb, Ti and Sb under an argon atmosphere. The obtained ingots are mechanically milled to get submicron-scale powders. The obtained powders are compacted by spark plasma sintering to obtain the final bulk p-type FeNbTiSb thermoelectric materials. The compositional elements of these p-type FeNbTiSb thermoelectric materials are abundant in the earth crust. The p-type thermoelectric materials also shows good high temperature stability and the preparation method are simple and high-yield. Therefore, the industrial production cost would be relatively cheap. The maximum zT value of the p-type thermoelectric materials is 1.1 at 1100K, which is the highest value among the p-type Half-Heusler system.

主权项

1. A high figure of merit p-type FeNbTiSb thermoelectric material, whose composition is FeNb1-xTixSb, wherein x=0.06˜0.24; and the thermoelectric material is obtain by the following method:
(1) preparing ingots by three-time levitation melting of stoichiometric amounts of Fe, Nb, Ti and Sb under an argon atmosphere; (2) mechanically milling the ingots to obtain powders, compacting the powders to obtain the p-type FeNbTiSb thermoelectric material; wherein, in step (2), final bulk p-type FeNbTiSb thermoelectric material is sintered by spark plasma sintering at 850° C. for 10 minutes under 65 MPa.