Thermoelectric material and process for producing it

摘要

Thermoelectric material of (Bi, Sb)(Te, Se) system is produced through a liquid quenching method and an extrusion from a die unit having an inlet portion and an outlet portion crossing each other at 30 - 150 degrees so that the crystal grains have an average grain size equal to or less than 30 microns and (001) planes (1a) mostly oriented in parallel to a direction (A) in which electric current to flow, thereby achieving the figure of merit equal to or greater than 3.0 × 10 -3 / K.