Research on the preparation and properties of the P-type Bi2Te3 based material with high preferred orientation

In order to solve problems of low preferred orientation, poor mechanical strength and low thermoelectric properties of the (00l) face of the P-type Bi2Te3-based material, an alloy ingot with very good orientation was produced by magnetic levitation melting technology which is rapid induction melting and casting into a water-cooled copper with Bi0.4Sb1.6Te3+3wt.%Te crystal bar as raw materials. SEM and XRD pattern of casted ingots, alloy powders, hot-pressed sintered blocks were done, and the effect of powder particle size on the electrical properties of sintered block were studied. The results show that the powder after quenching, crushing and screening is highly oriented along the (00l) crystal face. The zone melting N-type matches the conventional 127 pair 4 cm*4 cm refrigeration TEC, and the maximum temperature difference of the model TEC1-12706 device can reach 70℃,which provides a direction for the preparation of high-performance Bi2Te3-based thermoelectric materials.