Ba8Ga15XSi30(X= Ga、Zn、Cu)的热电性能研究

doi:10.15541/jim20140403

摘要/Abstract

摘要：

采用电弧炉熔炼、球磨、放电等离子烧结的方法合成了系列第I类笼状化合物Ba₈Ga₁₅XSi₃₀(X=Ga、Zn、Cu)。研究了Zn、Cu对Ga的替代对材料结构以及热电性能的影响。结果表明, 相比于Ba₈Ga₁₆Si₃₀, Zn、Cu的掺杂使得样品的晶格常数减小, 热导率降低, Seebeck系数的绝对值增大, ZT值有明显的升高。

关键词: I类笼状化合物, 晶格常数, 热电性能

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

中图分类号:

O469

刘丽华, 宋奔升, 栗峰, 王镇, 潘浩瀚, 李阳. Ba₈Ga₁₅XSi₃₀(X= Ga、Zn、Cu)的热电性能研究[J]. 无机材料学报, 2015, 30(3): 261-266.

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.

图/表 7

图1 名义配比为Ba8Ga15XSi30(X=Ga、Zn、Cu)样品的XRD精修图谱

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

表1 Ba8Ga15XSi30 (X=Ga、Zn、Cu) 样品EDS及GSAS成分分析结果

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)

图2 Ba8Ga15XSi30(X=Ga、Zn、Cu)的Seebeck系数S随温度的变化曲线

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

图3 Ba8Ga15XSi30(X=Ga、Zn、Cu)的电导率σ随温度的变化曲线

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

图4 Ba8Ga15XSi30(X=Ga、Zn、Cu)的热导率κ 随温度的变化曲线

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

图5 Ba8Ga15XSi30(X=Ga、Zn、Cu)的晶格热导率κL随温度的变化曲线

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

图6 Ba8Ga15XSi30(X=Ga、Zn、Cu)的ZT值随温度的变化曲线

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

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Ba₈Ga₁₅XSi₃₀(X= Ga、Zn、Cu)的热电性能研究

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

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