具有高度异构的异构性和超低的平面外晶格导热率的多层PbClF型材料
S C Rakesh Roshan1,2, N Yedukondalu3,4, Rakesh Kumar Rajaboina5
1Rajiv Gandhi University of Knowledge Technologies, Basar, Telangana 504107, India.
Inorganic chemistry
|February 12, 2024
概括
层层的土环化物提供可调节的导热性. 具有大轴比和弱范德瓦尔斯结合的材料在热管理中显示出超低晶格导热率的潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 固态化学 固态化学
背景情况:
- 极端格子导热率 (κl) 对于热能管理至关重要.
- 由于粘合异质性,分层材料提供了设计灵活性.
- 了解晶体结构,结合,格子动态和声子传输是层状材料的关键.
研究的目的:
- 调查土化物 (MXF) 中的晶体结构,粘合和晶格导热率之间的关系.
- 探索这些分层材料在热能管理应用中的潜力.
- 为设计具有可调节热传输特性的材料提供见解.
主要方法:
- 分析晶体结构和轴比 (c/a).
- 研究结合特性,包括离子和范德瓦尔斯 (vdWs) 相互作用.
- 声子密度的状态和格子导热率 (κl) 异构的计算.
主要成果:
- 土环化物表现出异性热导电性,受轴键和比率的影响.
- 具有较大的轴比的材料 (例如,CaBrF,CaIF,SriF) 显示出显著的异质性,其中一些元素充当"声器".
- 超低的外平面 κl (<1 W/m K) 预测为CaBrF,CaIF和SriF,由于vdWs的结合力较弱.
结论:
- 虽然MXF化合物具有相似的结构,但它们的热导电性异型,从高度异型到同型.
- 具有较大的轴比和可调节的平面外粘合 (离子到vdWs) 的分层材料对低 κl 应用具有前景.
- 这项研究为设计通过控制声传输来进行热管理的先进材料提供了基础.
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