中国物理B ›› 2012, Vol. 21 ›› Issue (1): 17401-017401.doi: 10.1088/1674-1056/21/1/017401

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Sn-based type-VIII single-crystal clathrates with a large figure of merit

邓书康, 李德聪, 申兰先, 郝瑞亭   

  1. Key Laboratory of Advanced Technique & Preparation for Renewable Energy Materials of Ministry of Education Solar Energy Research Institute, Yunnan Normal University, Kunming 650092, China 
  • 收稿日期:2011-05-04 修回日期:2011-08-30 出版日期:2012-01-15 发布日期:2012-01-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 50902119).

Sn-based type-VIII single-crystal clathrates with a large figure of merit

Deng Shu-Kang(邓书康)a)†, Li De-Cong(李德聪)a), Shen Lan-Xian(申兰先)a), Hao Rui-Ting(郝瑞亭)a), and T. Takabatakeb)   

  1. a Key Laboratory of Advanced Technique & Preparation for Renewable Energy Materials of Ministry of Education Solar Energy Research Institute, Yunnan Normal University, Kunming 650092, China; b Department of Quantum Matter, ADSM and IAMR Hiroshima University, Higashi-Hiroshima 739-8530, Japan
  • Received:2011-05-04 Revised:2011-08-30 Online:2012-01-15 Published:2012-01-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 50902119).

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摘要： Single-crystal samples of type-VIII Ba8Ga16 - xCuxSn30 (x=0, 0.03, 0.06, 0.15) clathrates were prepared using the Sn-flux method. At room temperature the carrier density, n, is 3.5-5×1019 cm-3 for all the samples, the carrier mobility, μH, increases to more than twice that of Ba8Ga16Sn30 for all the Cu doping samples, and consequently the electrical conductivity is enhanced distinctly from 1.90×104 S/m to 4.40×104 S/m, with the Cu composition increasing from x=0 to x=0.15. The Seebeck coefficient, α , decreases slightly with the increases in Cu composition. The κ values are about 0.72 W/mK at 300 K and are almost invariant with temperature up to 500 K for the samples with x=0 and x=0.03. The lattice thermal conductivity, κL, decreases from 0.59 W/mK for x=0 to 0.50 W/mK for x=0.03 at 300 K. The figure of merit for x=0.03 reaches 1.35 at 540 K.

关键词: thermoelectric material, type-VIII clathrate, thermoelectric properties

Abstract: Single-crystal samples of type-VIII Ba8Ga16 - xCuxSn30 (x=0, 0.03, 0.06, 0.15) clathrates were prepared using the Sn-flux method. At room temperature the carrier density, n, is 3.5-5×1019 cm-3 for all the samples, the carrier mobility, μH, increases to more than twice that of Ba8Ga16Sn30 for all the Cu doping samples, and consequently the electrical conductivity is enhanced distinctly from 1.90×104 S/m to 4.40×104 S/m, with the Cu composition increasing from x=0 to x=0.15. The Seebeck coefficient, α , decreases slightly with the increases in Cu composition. The κ values are about 0.72 W/mK at 300 K and are almost invariant with temperature up to 500 K for the samples with x=0 and x=0.03. The lattice thermal conductivity, κL, decreases from 0.59 W/mK for x=0 to 0.50 W/mK for x=0.03 at 300 K. The figure of merit for x=0.03 reaches 1.35 at 540 K.

Key words: thermoelectric material, type-VIII clathrate, thermoelectric properties

中图分类号:  (Transport properties)

  • 74.25.F-
72.15.Jf (Thermoelectric and thermomagnetic effects) 72.15.Eb (Electrical and thermal conduction in crystalline metals and alloys)