在新半导体材料Ba2.75Pb1.1Sb4.1Se10中使用Te的半导体转化
Swati1, Subhendu Jana1, Sayani Barman1
1Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502284, India. jaiprakash@chy.iith.ac.in.
Dalton transactions (Cambridge, England : 2003)
|August 26, 2025
概括
合成了新的半导体抗氧化,Ba2.75Pb1.1Sb4.1Se10-δTeδ. 替代增强了电导率和热电性能,达到了0.09的zT值.
科学领域:
- 材料科学
- 固态化学
- 无机化学
背景情况:
- 含的半导体石化物对热电和光电子应用具有前景.
- 开发具有更好的热电性质的新材料对于能源采集和电子设备至关重要.
研究的目的:
- 为了合成和描述一种新的含多晶石化物,Ba2.75Pb1.1Sb4.1Se10-δTeδ (δ=0至4).
- 研究这些材料的结构,电气和热性能.
- 评估它们的热电应用潜力.
主要方法:
- 通过在1073K的加热元件合成多晶样品
- 单晶X射线衍射用于基因化物的结构确定.
- 用粉末X射线衍射 (PXRD) 来研究Te替代.
- 光学带隙测量
- 在773K的温度下测量热导率和电导率.
主要成果:
- 基因化合物Ba2.75Pb1.1Sb4.1Se10在单临床P21/c空间组中结晶.
- 根据维加德定律,高达40%的Se原子可以被Te替换.
- 具有 δ = 0,1,2 的样本表现出半导体行为,而 δ = 3,4 则表现出半金属导体性.
- 在773K时观察到Ba2.75Pb1.1Sb4.1Se10的超低导热率 (κtot ≈ 0.24 W m-1 K-1).
- 这种替换显著改善了电导率,使得在773 K的温度下 δ = 4 的热电功率值 (zT) 提高到0.09.
结论:
- 合成的Ba2.75Pb1.1Sb4.1Se10-δTeδ系列通过Te替换显示可调节的电子特性.
- 这些材料具有有前途的低导热性和改进的电传输,使它们成为热电器件的潜在候选者.
- 进一步优化可能会提高热电性能.
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