- 著者
-
青木 昌治
菅 義夫
- 出版者
- 公益社団法人 応用物理学会
- 雑誌
- 応用物理 (ISSN:03698009)
- 巻号頁・発行日
- vol.29, no.6, pp.363-370, 1960
For the purpose of obtaining superior thermoelectric materials, purification of Bi, Te and Bi<sub>2</sub>Te<sub>3</sub> has been carried out.<br> Bismuth is purified by the method of alkali-treatment and zone melting in removing Cu, Ag and Pb.<br> For the purification of tellurium, vacuum distillation is very efficient to remove Cu, Ag and Pb.<br> Measured thermoelectric power a and resistivity of purified Bi<sub>2</sub>Te<sub>3</sub> were α=235μV•deg<sup>-1</sup>, and p=1.16×10<sup>-3</sup>Ω•cm respectively.<br> The influence of addictive impurities on Bi<sub>2</sub>Te<sub>3</sub> is examined. Tl, Li, Pb and Cd etc. are p-type and Cu, Ag, Se, Te, halogen and metal-halides etc. are n-type impurities.<br> The thermoelectric properties of PbTe, Sb<sub>2</sub>Te<sub>3</sub>, Bi<sub>2</sub>Te<sub>3</sub>-Sb<sub>2</sub>Te<sub>3</sub> and Bi<sub>2</sub>Te<sub>3</sub>-Bi<sub>2</sub>Se<sub>3</sub> solid solution are examined. The result shows that the solid solution of isomorphous compounds is suitable for the thermoelectric material.<br> By the use of (Bi-Sb)<sub>2</sub>Te<sub>3</sub> <i>p</i>-type element and Bi<sub>2</sub>(Te-Se)<sub>3</sub> <i>n</i>-type element thermojunctions, the temperature drop of 71.3 deg was attained with a temperature of hot junction of 30°C.