Thermoelectric Properties of Nb-doped Lead Telluride Alloys

doi:10.11901/1005.3093.2014.122

Chinese Journal of Materials Research

2015, Vol. 29

Issue (2): 115-119 DOI: 10.11901/1005.3093.2014.122

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Thermoelectric Properties of Nb-doped Lead Telluride Alloys

Jie ZHAO^1,²,Caini XIN^1,²,Yemao HAN^1,²,Min ZHOU^1,^*(

),Rongjin HUANG¹,Laifeng LI¹

1. State Key Laboratory of Technologies in Space Cryogenic Propellants, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2. University of Chinese Academy of Sciences, Beijing 100049, China

Cite this article:

Jie ZHAO,Caini XIN,Yemao HAN,Min ZHOU,Rongjin HUANG,Laifeng LI. Thermoelectric Properties of Nb-doped Lead Telluride Alloys. Chinese Journal of Materials Research, 2015, 29(2): 115-119.

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Abstract

Bulk Nb-doped lead telluride Pb_1.1Te was prepared by using a combined process of mechanical alloying (MA) and spark plasma sintering (SPS). Then its transport properties such as electrical resistivity, Seebeck coefficient and thermal diffusion coefficient were measured in a temperature range from 323 K to 673 K. As a result, the doped Nb can effectively enhance the phonon scattering ability of the lead telluride Pb_1.1Te, and optimize its electrical performance as well. Large power factors of over 20 mW/(cm·K²) were obtained in a wide temperature range (523-623 K). In addition, the thermal conductivity decreased with the increasing Nb content, which may also be resulted from the increase of the phonon scattering ability, thereby an optimal ZT value may be found. A maximum ZT value of 1.27 was obtained for Pb_1.03Nb_0.07Te at 673 K, which was twice as high as that for the un-doped Pb_1.1Te.

Key words: metallic materials Seebeck coefficient lattice thermal conductivity n-type PbTe alloys

Received: 17 March 2014

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	Jie ZHAO
	Caini XIN
	Yemao HAN
	Min ZHOU
	Rongjin HUANG
	Laifeng LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.122 OR https://www.cjmr.org/EN/Y2015/V29/I2/115

Fig.1 XRD spectra for the samples of Pb_1.1-_xNb_xTe (x=0, 0.02, 0.04, 0.06, 0.07, 0.08)

Fig.2 SEM images of fracture surface for Pb_1.1Te (a) and Pb_1.03Nb_0.07Te (b)

Fig.3 Electrical resistivity(a), Seebeck coefficient (b) and power factor (c) of Pb_1.1-_xNb_xTe (x=0, 0.02, 0.04, 0.06, 0.07, 0.08) as a function of temperature, the violet stars are electrical resistivity and Seebeck coefficient at 323 K for pure PbTe reported in Ref [18]

Fig.4 Hall mobility as function of Hall carrier density of Pb_1.1-_xNb_xTe (x=0, 0.02, 0.04, 0.06, 0.07, 0.08) at 300 K

Fig.5 Temperature dependence of the total thermal conductivity κ (a) and lattice thermal conductivity κ_l (b) for Pb_1.1-_xNb_xTe

Fig.6 ZT as a function of temperature for Pb_1.1-_xNb_xTe (x=0, 0.02, 0.04, 0.06, 0.07, 0.08)

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