Synthesis and high temperature thermoelectric properties of calcium and cerium double-filled skutterudites Ca0.1CexCo4Sb12
Synthesis and high temperature thermoelectric properties of calcium and cerium double-filled skutterudites Ca0.1CexCo4Sb12
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DOI：
10.1088/0022-3727/42/10/105408
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发表时间：
2009-04
期刊：
影响因子：
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通讯作者：
D. Li;K. Yang;H. Hng;Q. Yan;J. Ma;T. Zhu;X. Zhao
中科院分区：
文献类型：
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作者：
D. Li;K. Yang;H. Hng;Q. Yan;J. Ma;T. Zhu;X. Zhao
研究了双填充方钴矿Ca0.1CexCo4Sb12（x = 0.05、0.10和0.15）在300至775 K温度范围内的热电性能。结果表明，在CoSb3中添加Ca和Ce作为填充原子导致晶格热导率大幅下降。在 323 K 下，Ca0.1Ce0.15Co4Sb12 样品中观察到的最小晶格热导率为 2.76 W K−1 m−1。与原始 CoSb3 相比，该热导率降低了 69%。此外，用Ca和Ce原子填充方钴矿晶格的空隙导致了类半导体行为（即dρ/dT 0）的转变以及塞贝克系数符号的变化。 Ca0.1Ce0.15Co4Sb12 样品获得了最高的无量纲品质因数 ZT。具体来说，它在677 K时达到0.83的ZT，是文献报道的单填充Ca0.2Co4Sb12的两倍。
The thermoelectric properties of double-filled skutterudites Ca0.1CexCo4Sb12 (x = 0.05, 0.10 and 0.15) were investigated at temperatures ranging from 300 to 775 K. The results showed that the addition of Ca and Ce as filler atoms into CoSb3 led to a substantial decrease in lattice thermal conductivity. The minimum lattice thermal conductivity of 2.76 W K−1 m−1 was observed in the sample Ca0.1Ce0.15Co4Sb12 at 323 K. This is a 69% reduction as compared with pristine CoSb3. Moreover, filling the voids of the skutterudite crystal lattice with Ca and Ce atoms led to a transition from semiconducting-like behaviour (i.e. dρ/dT 0) as well as a change in the sign of the Seebeck coefficient. The highest dimensionless figure of merit, ZT, was obtained for the sample Ca0.1Ce0.15Co4Sb12. Specifically, it reached ZT of 0.83 at 677 K, which is double that of single-filled Ca0.2Co4Sb12 reported in the literature.