| abstract |
The invention discloses a thermoelectric ceramic material and a preparation method thereof, wherein the method comprises: (1) mixing Se powder, Bi powder, Bi 2 O 3 powder, Ln 2 O 3 powder and Cu powder and then compressing them into tablets, so that Obtaining a precursor; (2) heating the precursor to cause a self-propagating reaction of the precursor to obtain a reacted block; (3) pulverizing and grinding the reacted block and performing spark plasma sintering , in order to obtain Bi 2 LnO 4 Cu 2 Se 2 thermoelectric ceramic materials. The method of the present application is simple in process, low in cost, short in preparation process, and takes less than 2 hours in total, and can be suitable for mass production, thereby realizing engineering application. In addition, the complex oxygen-containing layered compound Bi 2 LnO 4 Cu 2 Se 2 thermoelectric ceramic materials with low thermal conductivity, high electrical conductivity and good thermoelectric properties can be prepared by this method, which has potential in the fields of waste heat power generation and electrothermal refrigeration. Value. |