Preparation and Thermoelectric Properties of  (Mg2Si1-xSbx)0.4-(Mg2Sn)0.6 Alloys

doi:10.3724/SP.J.1077.2012.11550

Journal of Inorganic Materials ›› 2012, Vol. 27 ›› Issue (8): 822-826.DOI: 10.3724/SP.J.1077.2012.11550

• Research Paper • Previous Articles Next Articles

Preparation and Thermoelectric Properties of (Mg₂Si_1-xSb_x)_0.4-(Mg₂Sn)_0.6 Alloys

HAN Zhi-Ming, ZHANG Xin, LU Qing-Mei, ZHANG Jiu-Xing, ZHANG Fei-Peng

(College of Materials Science and Engineering, Beijing University of Technology, The key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing 100124, China)

Received:2011-08-30 Revised:2011-10-18 Published:2012-08-20 Online:2012-07-09
About author:HAN Zhi-Ming. E-mail: 0402hzm@163.com
Supported by:
National Natural Science Foundation of China (50801002); Beijing Natural Science Foundation (2112007); Founding Project for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of Beijing Municipality (PHR20110812)

Abstract

Abstract: n-type (Mg₂Si_1-xSb_x)_0.4-(Mg₂Sn)_0.6 (0≤x≤0.0625) alloys were prepared by an induction melting and spark plasma sintering method using bulks of Mn, Si, Sn, Sb as raw materials. The analyzing results of the structure and thermoelectric properties show that the single-phase (Mg₂Si_1-xSb_x)_0.4-(Mg₂Sn)_0.6 alloys can be obtained at 8wt% excess of Mg addition. The lattice constant increases linearly with the amount of Sb, the electrical resistivity ρ firstly increases and then decreases. The electrical resistivity ρ of samples (x≤0.025) shows semi-conductor behavior, while that of the samples (x>0.025) shows the metallic behavior. The Seebeck coefficient a firstly increases and then decreases with the increase of x value. Compared with the non-doped sample, the thermal conductivity k for samples (x≤0.025) decreases and that of the other samples (x>0.025) increases. The ZT value for (Mg₂Si_0.95Sb_0.05)_0.4-(Mg₂Sn)_0.6 sample reaches its highest value of 1.22 at 773 K, which is much higher than that of the non-doped sample.

Key words: Mg₂Si base thermoelectric materials, Sb doping, thermoelectric properties, spark plasma sintering

CLC Number:

HAN Zhi-Ming, ZHANG Xin, LU Qing-Mei, ZHANG Jiu-Xing, ZHANG Fei-Peng. Preparation and Thermoelectric Properties of (Mg₂Si_1-xSb_x)_0.4-(Mg₂Sn)_0.6 Alloys[J]. Journal of Inorganic Materials, 2012, 27(8): 822-826.

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Preparation and Thermoelectric Properties of (Mg₂Si_1-xSb_x)_0.4-(Mg₂Sn)_0.6 Alloys

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