Thermoelectric Properties of In4Se3 Synthesized by Combing Sonochemical and SPS Method

doi:10.3724/SP.J.1077.2012.00201

Abstract

Abstract:

Single-phase In₄Se₃ powders were synthesized by a sonochemical method combined with subsequent deoxidizing heat-treatment, and a bulk sample was prepared via a spark plasma sintering (SPS) method. The phase composition, microstructures and thermoelectric transport properties of the as-prepared bulk sample were studied. The bulk sample possesses refined crystalline and obvious anisotropy observed in the different directions, where a large number of fine layered structures exist along the SPS pressing direction. Therefore, the thermoelectric properties of the bulk sample also show significant anisotropy. Owing to higher Seebeck coefficient and lower thermal conductivity, a better ZT is achieved in direction of the SPS pressure compared with the perpendicular direction. As a result, the maximum ZT reaches 0.56 at 700 K, which is comparable with that of the samples synthesized by other physical techniques.

Key words: In₄Se₃, sonochemicial method, anisotropy, thermoelectric properties

CLC Number:

TB34

LIU Dan-Dan, WANG Shan-Yu, TANG Xin-Feng. Thermoelectric Properties of In₄Se₃ Synthesized by Combing Sonochemical and SPS Method[J]. Journal of Inorganic Materials, 2012, 27(2): 201-204.

Figures/Tables 5

Fig. 1 XRD pattern of the sample sintered by SPS method

Fig. 2 FESEM images of bulk sample in (a)(b) AZ direction and (c)(d) PZ direction

Fig. 3 Temperature dependences of (a) electrical conductivities, (b) seebeck coffecient, (c) power factors and (d) Thermal conductivities of the sample in different directions

Table 1 Values of Hall coefficient RH, electrical resistivity ρ, carrier concentration n, mobility μH and Seebeck coefficient α at room temperature

Direction	R_H/(×10^-6, m³·C^-1)	ρ/(m Ω·m)	n/(×10¹⁸, cm^-3)	μ_H/(cm²·V^-1·s^-1)	α?(μV·K^-1)
AZ	-1.61	1.837	-3.9	8.8	-209.4
PZ	-1.27	0.796	-4.9	16.0	-52.4

Fig. 4 Temperature dependences of ZT value of the sample in different directions

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Thermoelectric Properties of In₄Se₃ Synthesized by Combing Sonochemical and SPS Method

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