Effect of Powder Heat Treatment on Chemical Composition and Thermoelectric Properties of Bismuth Antimony Telluride Alloys Fabricated by Combining Water Atomization and Spark Plasma Sintering

Materials

Dong-won Shin¹  Jun-Woo Song¹  Soon-Jik Hong¹  Peyala Dharmaiah¹ 

[1] Division of Advanced Materials Engineering, Institute for Rare Metals, Kongju National University, 275, Budae-dong, Cheonan City 330-717, Chungcheongnam-do, Korea;

关键词: water atomization;    bismuth antimony telluride;    spark plasma sintering;    heat treatment;    thermoelectric materials;   

DOI  :  10.3390/ma14112993

来源: DOAJ

【 摘 要 】

In this work, Bi₀.₅Sb₁.₅Te₃ materials were produced by an economically viable and time efficient water atomization process. The powder samples were heat treated at different temperatures (673 K, 723 K, 743 K, 773 K, 803 K, and 823 K) followed by spark plasma sintering (SPS). It was found that the Te evaporated slightly at 723 K and 743 K and became dominated at 773 K, 803 K, and 823 K, which severely influences the thermoelectric properties. The electrical conductivity was significantly improved for over 803 K heat treated samples due to the remarkable improvement in hole concentration. The power factor values for the 803 K and 823 K samples were significantly larger at T > 350 K compared to other samples. Consequently, the peak ZT of 0.92 at 350 K was obtained for the 803 K sample, which could be useful in commercial thermoelectric power generation.

【 授权许可】

Unknown