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Synthesis and thermoelectric properties of Mn-doped AgSbTe2 compounds
Authors:Zhang He  Luo Jun  Zhu Hang-Tian  Liu Quan-Lin  Liang Jing-Kui  Li Jing-Bo  Liu Guang-Yao
Affiliation:a State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;b Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Abstract: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.
Keywords:AgSbTe2  phase stability  crystal structure  thermoelectric properties
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