Thermoelectric Properties of Ba8Ga15XSi30 (X= Ga, Zn, Cu)

doi:10.15541/jim20140403

Abstract

Abstract:

A series of Ba₈Ga₁₅XSi₃₀ (X=Ga、Zn、Cu) clathrate samples were prepared by combining arc melting, ball milling and spark plasma sintering (SPS) techniques. The crystal structure and thermoelectric properties of all samples were studied. Compared with Ba₈Ga₁₆Si₃₀, the lattice constant a decreases as one Ga is replaced by Zn or Cu. What’s more, thermal conductivity decreases and magnitude of Seebeck coefficient increases with Zn or Cu doping. Consequently, thermoelectric figure of merit ZT increases significantly.

Key words: type-I clathrate, lattice constant, thermoelectric properties

CLC Number:

O469

LIU Li-Hua, SONG Ben-Sheng, LI Feng, WANG Zhen, PAN Hao-Han, LI Yang. Thermoelectric Properties of Ba₈Ga₁₅XSi₃₀ (X= Ga, Zn, Cu)[J]. Journal of Inorganic Materials, 2015, 30(3): 261-266.

Figures/Tables 7

Fig. 1 XRD refinement for samples with nominal formula Ba8Ga15XSi30(X=Ga、Zn、Cu)

Table 1 Analytical results of chemical components for Ba8Ga15XSi30 (X=Ga、Zn、Cu) by EDS and GSAS

Nominal composition	Actual composition by GSAS	Actual composition by EDS
Ba₈Ga₁₆Si₃₀	Ba_8.00Ga_14.4(9)Si_31.5(1)	Ba_8.0(2)Ga_14.8(6)Si_31.1(4)
Ba₈Ga₁₅ZnSi₃₀	Ba_8.00Ga_14.4(0)Zn_1.0(5)Si_30.5(5)	Ba_7.9(7)Ga_14.5(7)Zn_1.0(0)Si_30.4(3)
Ba₈Ga₁₅CuSi₃₀	Ba_8.00Ga_14.4(5)Cu_0.8(5)Si_30.7(0)	Ba_8.0(0)Ga_14.7(6)Cu_0.7(9)Si_30.4(5)

Fig. 2 Temperature dependence of the Seebeck coefficient S for Ba8Ga15XSi30 (X=Ga、Zn、Cu)

Fig. 3 Temperature dependence of the electrical conductivity σ of Ba8Ga15XSi30 (X=Ga、Zn、Cu)

Fig. 4 Thermal conductivity κ versus temperature of Ba8Ga15XSi30 (X=Ga、Zn、Cu)

Fig. 5 Lattice thermal conductivity κL versus temperature of Ba8Ga15XSi30 (X=Ga、Zn、Cu)

Fig. 6 Thermoelectric figure of merit ZT of Ba8Ga15XSi30 (X=Ga、Zn、Cu)

References 32

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Thermoelectric Properties of Ba₈Ga₁₅XSi₃₀ (X= Ga, Zn, Cu)

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