超晶格和层状结构传热特性的连续模型及其在能源材料设计中的应用
发布时间：2018-11-06 08:49
【摘要】：层状材料和超晶格结构为提高热电材料和隔热涂层提供了新的设计思路,并成为最近的研究热点.应用连续波动方程和线性阻尼理论,本文研究了此类材料中的声子输运特性.给出了在整个相空间里的界面调制和声子局域化效应,得出了超晶格材料热导率的上极限和下极限;同时,分析表明界面锐化加强了声子带隙,使得部分模态的声子局域化加强.最后,通过对石墨烯/氮化硼超晶格(G/hBN)和硅/锗超晶格的分子模拟(Si/Ge),验证了该理论模型.该方法适用于所有的层状材料和超晶格结构,对此类新能源材料的设计提供了普适的设计思路.
[Abstract]:Layered materials and superlattice structures provide a new design idea for improving thermoelectric materials and thermal insulation coatings, and have become a hot research topic recently. Using the continuous wave equation and the linear damping theory, the phonon transport characteristics in this kind of materials are studied in this paper. The interface modulation and phonon localization effects in the whole phase space are given, and the upper and lower limits of thermal conductivity of superlattice materials are obtained. At the same time, the analysis shows that the interface sharpening strengthens the phonon band gap, which strengthens the local phonon localization of some modes. Finally, the theoretical model is verified by molecular simulation of graphene / boron nitride superlattice (G/hBN) and silicon / germanium superlattice (Si/Ge). This method is suitable for all layered materials and superlattice structures and provides a general design idea for the design of such new energy materials.
【作者单位】： 耶鲁大学材料科学与机械工程系;纽约城市大学物理系 列维奇本杰明研究所;
【基金】：国家自然科学基金(批准号:DMR-0934206)资助的课题~~
【分类号】：TB34
本文编号：2313802
[Abstract]:Layered materials and superlattice structures provide a new design idea for improving thermoelectric materials and thermal insulation coatings, and have become a hot research topic recently. Using the continuous wave equation and the linear damping theory, the phonon transport characteristics in this kind of materials are studied in this paper. The interface modulation and phonon localization effects in the whole phase space are given, and the upper and lower limits of thermal conductivity of superlattice materials are obtained. At the same time, the analysis shows that the interface sharpening strengthens the phonon band gap, which strengthens the local phonon localization of some modes. Finally, the theoretical model is verified by molecular simulation of graphene / boron nitride superlattice (G/hBN) and silicon / germanium superlattice (Si/Ge). This method is suitable for all layered materials and superlattice structures and provides a general design idea for the design of such new energy materials.
【作者单位】： 耶鲁大学材料科学与机械工程系;纽约城市大学物理系 列维奇本杰明研究所;
【基金】：国家自然科学基金(批准号:DMR-0934206)资助的课题~~
【分类号】：TB34
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