PRODUCTION OF THERMOELECTRIC MATERIALS BASED ON BISMUTH AND STIBIUM TELLURIDES

摘要

FIELD: process engineering.;SUBSTANCE: invention relates to production of thermoelectric materials based on bismuth and stibium tellurides. Claimed process consists in pretreatment of initial components by vacuum distillation, synthesis of initial components in evacuated ampoules at heating to melting and cooling. Crystals are grown by vertical zone recrystallisation with application of high-frequency heating. Note here that the crystals are grown in at least two passes at the rate of not over 2.5-3 cm/h. Said high-frequency heating is conducted in the frequency of 1.76 MHz at the temperature gradient of 200 K/cm. The crystals grown, powders are made with nanostructure not over 200 nm in size to allow anisotropy of properties of every particle. Then, pelletising, sintering and hot extrusion are conducted. Said crystals are grown simultaneously in 6-10 ampoules up to 1 m long. Sintering is executed in the vacuum furnace for a day at about 450 degrees. After extrusion, the specimens are cut mechanically and complex measurements are performed.;EFFECT: higher strength, homogeneous properties, better thermoelectric characteristics.;4 cl, 2 dwg, 3 tbl