在未使用和使用过的BiCuSeO中调查Cu-site障碍
Sheetal Jain1, Christopher John Smit Heath2, Dixshant Shree Shreemal2
1Department of Physics, University of Toronto, 60 St George Street, Toronto, Ontario, M5S 1A7, CANADA.
概括
在甲铜氧化物 (BiCuSeO) 中铜位点的乱解释了其低导热性. 银剂保留了这种障碍,对热电性能至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 热电学是一种热电学.
背景情况:
- 铜氧化物 (BiCuSeO) 是一个有前途的热电材料.
- 它的高热电效率是由兴奋剂增强的,特别是与银 (Ag).
研究的目的:
- 研究BiCuSeO中低晶格导热率的起源.
- 确定银 (Ag) 兴奋剂在修改这种性质中的作用.
主要方法:
- 进行X射线衍射 (XRD) 研究.
- 扩展的X射线吸收细结构 (EXAFS) 光谱学.
主要成果:
- 铜 (Cu) 的热位移参数在未使用的BiCuSeO中显著较大.
- 取代Cu的Ag剂也表现出很大的热位移参数,即使在低温下也是如此.
- 在Cu位点上有局部,静态或准静态障碍的证据,与""模式一致.
结论:
- 铜 (Cu) 位点的局部性障碍是BiCuSeO中低晶格导热率的主要原因.
- 银 (Ag) 兴奋剂保护了这一关键疾病,有助于提高热电效率.
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