稀土掺杂对锡基Half-Heusler合金热电特性的影响

doi:10.3724/SP.J.1077.2010.00573

无机材料学报 ›› 2010, Vol. 25 ›› Issue (6): 573-576.DOI: 10.3724/SP.J.1077.2010.00573

稀土掺杂对锡基Half-Heusler合金热电特性的影响

李晓光, 霍德璇, 何才君, 赵士超, 吕燕飞

(杭州电子科技大学材料物理研究所, 杭州 310018)

收稿日期:2009-10-14 修回日期:2009-12-08 出版日期:2010-06-20 网络出版日期:2010-05-12
基金资助:
浙江省科技计划项目(2007C24015)

Effect of Rare-earth Doping on the Thermoelectric Properties of the Tin-based Half-Heusler Alloys

LI Xiao-Guang, HUO De-Xuan, HE Cai-Jun, ZHAO Shi-Chao, Lü Yan-Fei

(Institute of Materials Physics, Hangzhou Dianzi University, Hangzhou 310018, China)

Received:2009-10-14 Revised:2009-12-08 Published:2010-06-20 Online:2010-05-12

摘要/Abstract

摘要： 采用电弧熔炼法和放电等离子体烧结法, 制备了稀土掺杂的金属间化合物Zr_1-xLa_xNiSn (x = 0.05, 0.1, 0.15, 0.2, 0.3, 0.4) 和Zr_0.98R_0.02NiSn_0.98X_0.02(R = La, Ce; X = Sb, Bi). 用X射线衍射仪分析研究了它们的晶体结构随稀土替代量演化的规律. 在室温到700 K的范围内, 对其热电特性进行了评价. 研究结果表明, 代换量x小于0.15时, 稀土原子可以进入晶格形成单相化合物. 代换量x大于0.15的样品中含有非half-Heusler的第二相, 且含量随x增大而增加. 少量稀土掺杂可以有效地降低材料的热导率而保持良好的电输运特性. 在575 K, Zr_0.98La_0.02NiSn_0.98Sb_0.02的热电优值达到0.5.

关键词: 热电特性, ZrNiSn, CeNiSn, half-Heusler, 稀土

Abstract: Intermetallic compounds Zr_1-xLa_xNiSn (x = 0.05, 0.1, 0.15, 0.2, 0.3, 0.4) and Zr_0.98R_0.02NiSn_0.98X_0.02(R = La, Ce; X=Sb, Bi) were synthesized using arc melting and spark plasma sintering (SPS) techniques. The changes of their crystal structures were analyzed by using X-ray diffractometer. Thermoelectric properties were evaluated in the temperature range of 300 to 925 K. For x≤0.15, single-phase samples can be obtained. With x > 0.15, a non-half-heusler phase formed. The content of the second phase increases with x. For the samples with x≤0.15, rare-earth doping can effectively reduce the thermal conductivity while keeping good electrical transport. The maximum value of ZT was obtained in Zr_0.98La_0.02NiSn_0.98Sb_0.02, which reaches 0.5 at 575K.

Key words: thermoelectric properties, ZrNiSn, CeNiSn, half-Heusler, rare-earth

中图分类号:

TB34

李晓光, 霍德璇, 何才君, 赵士超, 吕燕飞. 稀土掺杂对锡基Half-Heusler合金热电特性的影响[J]. 无机材料学报, 2010, 25(6): 573-576.

LI Xiao-Guang, HUO De-Xuan, HE Cai-Jun, ZHAO Shi-Chao, Lü Yan-Fei. Effect of Rare-earth Doping on the Thermoelectric Properties of the Tin-based Half-Heusler Alloys[J]. Journal of Inorganic Materials, 2010, 25(6): 573-576.

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稀土掺杂对锡基Half-Heusler合金热电特性的影响

Effect of Rare-earth Doping on the Thermoelectric Properties of the Tin-based Half-Heusler Alloys

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