Synthesis and thermoelectric properties of Mn-doped AgSbTe2 compounds

doi:10.1088/1674-1056/21/10/106101

Abstract Polycrystalline p-type Ag_0.9Sb_1.1-xMn_xTe_2.05(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 Ag_0.9Sb_1.1-xMn_xTe_2.05 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.

Keywords: AgSbTe₂ phase stability crystal structure thermoelectric properties

Received: 05 April 2012
Revised: 19 June 2012
Accepted manuscript online:

PACS:	61.05.cp	(X-ray diffraction)
	64.60.My	(Metastable phases)
	73.50.Lw	(Thermoelectric effects)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11144002 and 51172276).

Corresponding Authors: Luo Jun
E-mail: jluo@aphy.iphy.ac.cn

Cite this article:

Zhang He (张贺), Luo Jun (骆军), Zhu Hang-Tian (朱航天), Liu Quan-Lin (刘泉林), Liang Jing-Kui (梁敬魁), Li Jing-Bo (李静波), Liu Guang-Yao (刘广耀) Synthesis and thermoelectric properties of Mn-doped AgSbTe₂ compounds 2012 Chin. Phys. B 21 106101

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Synthesis and thermoelectric properties of Mn-doped AgSbTe₂ compounds