高热电性质的n型AgBiSe2 AgBiSe2的高热电性质
Lin Pan1, David Bérardan, Nita Dragoe
1Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Sud , UMR 8182, Orsay F-91405, France, and CNRS , Orsay F-91405, France.
Journal of the American Chemical Society
|March 21, 2013
概括
这项研究使用 (Nb) 兴奋剂增强热电 (TE) 材料AgBiSe2. 优化的Ag0.96Nb0.04BiSe2显示了一倍的热电功率 (ZT) 到1,使其适用于中温应用.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 化学 化学 化学
背景情况:
- 热电 (TE) 材料将热量转化为电力.
- 无AgBiSe2是一种有前途的n型TE材料,但其性能需要改进.
- 与AgSbTe2相比,AgBiSe2使用的元素更丰富,更便宜.
研究的目的:
- 研究 (Nb) 兴奋剂对n型AgBiSe2.2的热电性质的影响.
- 为了提高中温应用的热电功率 (ZT).
主要方法:
- 固态合成原始的AgBiSe2 (Ag0.96Nb0.04BiSe2) 和Nb-doped的AgBiSe2 (Ag0.96Nb0.04BiSe2) 在固态中进行.
- 电传特性 (电阻,西贝克系数) 和导热性的表征.
- 对热电功率 (ZT) 的评估.
主要成果:
- 在n型AgBiSe2.2中,Nb兴奋剂增加了载体度.
- 用Nb补充的Ag0.96Nb0.04BiSe2表现出较低的电阻 (5.2 mΩ cm) 和高的Seebeck系数 (-218 μV/K).
- 在773K时的热电功率 (ZT) 从0.5增加到1的Nb-dopedAgBiSe2,由于其固有的低导热率 (0.7W m(-1) K(-1)).
结论:
- Nb兴奋剂显著提高了n型AgBiSe2.2的热电性能.
- Ag0.96Nb0.04BiSe2 是一种有前途的无材料,可用于中温热电应用.
- 这项研究强调了地球上丰富的元素在高效的热电能转换方面的潜力.
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