In a moderate temperature range (450-650 K), β-Zn 3:83+δSb3 has numerous advantages because the figure-of-merit (ZT) of β-Zn3:83+δSb3 is the highest in this temperature range. However there are difficulties when attempting to control the stoichiometry so as to manufacture Zn 3:83+δSb3 specimens. In this study, three different compositions, Zn3:83Sb3 [δ (excess Zn) = 0], Zn 3:9Sb3 (δ = 0:07), and Zn4Sb3 (δ = 0:17), were designed to obtain a β-Zn 3:83+δSb3 single phase through a hot-press sintering process. An investigation for the temperature dependence of thermoelectric properties confirmed that the Zn4Sb3 (δ = 0:17) composition hot-pressed at 723 K was the optimized condition for obtaining the Zn3:83+δSb3 single phase representing best thermoelectric properties. As a result, a maximum ZT value of 1.33 was obtained at a measuring temperature of 664 K for the Zn4Sb3 (δ = 0:17) composition hot-pressed at 723 K.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)