Synthesis and thermoelectric properties of Mn-doped AgSbTe<sub>2</sub> compounds |
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| Authors: | Zhang He ab Luo Jun b Zhu Hang-Tian b Liu Quan-Lin a Liang Jing-Kui b Li Jing-Bo b and Liu Guang-Yao |
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| Affiliation: | State Key Laboratory for Advanced Metals and Materials,School of Materials Science and Engineering,University of Science and Technology Beijing;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences |
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| Abstract: | Polycrystalline p-type Ag 0.9 Sb 1.1 x Mn x Te 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 0.9 Sb 1.1 x Mn x Te 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 Ag 2 Te 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 MnTe 2 impurities.The thermal analysis indicates that a tiny amount of Ag 2 Te phase exists in all these samples.The presence of the MnTe 2 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. |
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| Keywords: | AgSbTe 2 phase stability crystal structure thermoelectric properties |
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