Powder Metallurgic Synthesis of Mid-temperature Lead-free AgSn18SbTe20 Thermoelectric Materials and Processing Influence on Thermoelectric Performance

doi:10.15541/jim20140501

Abstract

Abstract:

Lead-free thermoelectric materials gain increasing attention for environmentally friendly power- generation applications derived from waste-heat sources. In this work, mid-temperature lead-free p-type AgSn₁₈SbTe₂₀ thermoelectric materials were fabricated by a process combining mechanical alloying (MA) and spark plasma sintering (SPS). Electrical conductivity, Seeback coefficient, power factor and thermal conductivity of the sintered samples were measured in the temperature range from 300 K to 723 K, and the thermoelectric figure of merit, ZT, values were calculated. The phase structures and morphologies of the samples were observed. The effects of milling time and sintering temperatures on thermoelectric properties were investigated. And the results show that properly prolonging milling time and decreasing sintering temperature can enhance thermoelectric performance of the materials. The ZT value can be enhanced by 59% through optimizing the processing parameters, resulting in a relatively high ZT up to 0.62 at 723 K when the materials are milled for 12 h and sintered at 743 K.

Key words: thermoelectric materials, mechanical alloying, spark plasma sintering, AgSn18SbTe20

CLC Number:

TB34

XING Zhi-Bo, LI Jing-Feng. Powder Metallurgic Synthesis of Mid-temperature Lead-free AgSn₁₈SbTe₂₀ Thermoelectric Materials and Processing Influence on Thermoelectric Performance[J]. Journal of Inorganic Materials, 2015, 30(8): 872-876.

Figures/Tables 8

Fig. 1 XRD patterns of powders milled for different time and bulk samples SPS sintered at different temperatures

Fig. 2 SEM images of powders milled for different time and bulks sintered at different temperatures after milled for 12 h (a) 4 h; (b) 8 h; (c) 12 h; (d) 12 h-803 K; (e) 12 h-773 K; (f) 12 h-743 K

Table 1 Density carrier concentrationcarrier concentrationcarrier concentrationcarrier concentrationcarrier concentrationof bulks sintered at 743 K with different milling times and of bulks sintered at different temperatures milled for 12 h

Milling time/h	4	8	12	16
Density/ (g·cm^-3)	6.15	6.19	6.17	6.21
Sintering temperature/K	743	773	803
Density/ (g·cm^-3)	6.17	6.21	6.28

Fig. 3 Temperature dependence of the electrical conductivities carrier concentrationcarrier concentrationcarrier concentrationcarrier concentrationcarrier concentrationof bulks sintered at 803 K with different milling time (a) and sintered at different temperatures after milled for 12 h (b)

Fig. 4 Temperature dependence of the Seebeck coefﬁcient of bulks sintered at 803 K with different milling time (a) and sintered at different temperatures after milled for 12 h (b)

Fig. 5 Temperature dependence of the power factor of bulks sintered at 803 K with different milling time (a) and sintered at different temperatures after milled at 12 h (b)

Fig. 6 Temperature dependence of the thermal conductivity of bulks sintered with different milling time (a) and different temperatures (b)

Fig. 7 Temperature dependence of ZT value of bulks sintered at 803 K with different milling time (a) and sintered at different temperatures after milled for 12 h (b)

References 13

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Powder Metallurgic Synthesis of Mid-temperature Lead-free AgSn₁₈SbTe₂₀ Thermoelectric Materials and Processing Influence on Thermoelectric Performance

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