中国物理B ›› 2012, Vol. 21 ›› Issue (10): 106101-106101.doi: 10.1088/1674-1056/21/10/106101
• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇 下一篇
张贺a b, 骆军b, 朱航天b, 刘泉林a, 梁敬魁b, 李静波b, 刘广耀b
Zhang He (张贺)a b, Luo Jun (骆军)b, Zhu Hang-Tian (朱航天)b, Liu Quan-Lin (刘泉林)a, Liang Jing-Kui (梁敬魁)b, Li Jing-Bo (李静波)b, Liu Guang-Yao (刘广耀)b
摘要: Polycrystalline p-type Ag0.9Sb1.1-xMnxTe2.05(x=0.05, 0.10, and 0.20) compounds have been prepared by a combined process of melt-quenching and spark plasma sintering. The sample composition of Ag0.9Sb1.1-xMnxTe2.05 has been specially designed in order to achieve the doping effect by replacing part of Sb with Mn and to present the uniformly dispersed Ag2Te phase in the matrix by adding insufficient Te, which is beneficial for optimizing the electrical transport properties and enhancing the phonon scattering effect. All the samples have the NaCl-type structure according to our X-ray powder diffraction analysis. After the treatment of spark plasma sintering, only the sample with x = 0.20 has a small amount of MnTe2 impurities. The thermal analysis indicates that a tiny amount of Ag2Te phase exists in all these samples. The presence of the MnTe2 impurity with high resistance and high thermal conductivity leads to the deteriorative thermoelectric performance of the sample with x=0.20 due to the decreased electrical transport properties and the increased thermal conductivity. In contrast, the sample with x=0.10 exhibits enhanced thermoeletric properties due to the Mn-doping effect. A dimensionless thermoelectric figure of merit of 1.2 is attained for the sample with x=0.10 at 573 K, showing promising thermoelectric properties in the medium temperature range.
中图分类号: (X-ray diffraction)