有希望的热电化合物CaAgSbb中的合金诱导的结构转变
A K M Ashiquzzaman Shawon1, Weeam Guetari1, Kamil Ciesielski2
1Department of Chemical Engineering and Material Science, Michigan State University, East Lansing, Michigan 48824, United States.
将CaAgSb与CaAgBi合金形成结构转变,影响热电性质. 富含二元的合金显示较低的洛伦兹数,解热导电性,以获得潜在的热电增强.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 辛特尔化合物因其热电潜力而引起人们的兴趣.
- AMX Zintl 化合物的分层结构是它们性质的关键.
研究的目的:
- 研究将正方形CaAgSb与六边形CaAgBi合金的效果.
- 描述所得到的固体溶液的结构性,弹性和热电性质.
- 探索通过结构修改来提高热电性能的潜力.
主要方法:
- 合成的CaAgSb$_{1-x}$Bi$_x$ 固体溶液.
- 用X射线衍射进行结构分析.
- 弹性模块测量.弹性模块测量.
- 热电传输测量 (大厅的移动性,电导率,热导率).
主要成果:
- 从3D转变为2D的结构转换发生在x ≈ 0.8.8.时.
- 弹性模块通常随着Bi含量的下降而减少,在相位过渡时显著硬化.
- 内在的CaAgSb在620K时显示了0.47的热电功率 (zT) 的峰值.
- 用Bi合金增加孔度,减少zT,但导致Bi丰富合金中的低洛伦兹数 (L).
结论:
- 在CaAgSb$_{1-x}$Bi$_x$中,3D到2D的结构过渡影响了弹性和热电性质.
- 虽然Bi合金最初减少了zT,但由此产生的低洛伦兹数为解导热提供了一条途径.
- 这些发现为优化热电材料的结构性和电子性质提供了洞察力.
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