Synthesis and thermoelectric properties of Mn-doped AgSbTe2 compounds

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

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

Synthesis and thermoelectric properties of Mn-doped AgSbTe₂ compounds

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

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

收稿日期:2012-04-05 修回日期:2012-06-19 出版日期:2012-09-01 发布日期:2012-09-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11144002 and 51172276).

Synthesis and thermoelectric properties of Mn-doped AgSbTe₂ compounds

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

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

Received:2012-04-05 Revised:2012-06-19 Online:2012-09-01 Published:2012-09-01
Contact: Luo Jun E-mail:jluo@aphy.iphy.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11144002 and 51172276).

摘要/Abstract

摘要： 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.

关键词: AgSbTe₂, phase stability, crystal structure, thermoelectric properties

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.

Key words: AgSbTe₂, phase stability, crystal structure, thermoelectric properties

中图分类号: (X-ray diffraction)

61.05.cp

64.60.My (Metastable phases) 73.50.Lw (Thermoelectric effects)

张贺, 骆军, 朱航天, 刘泉林, 梁敬魁, 李静波, 刘广耀. Synthesis and thermoelectric properties of Mn-doped AgSbTe₂ compounds[J]. 中国物理B, 2012, 21(10): 106101-106101.

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[J]. Chin. Phys. B, 2012, 21(10): 106101-106101.

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Synthesis and thermoelectric properties of Mn-doped AgSbTe₂ compounds

Synthesis and thermoelectric properties of Mn-doped AgSbTe₂ compounds

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