气候变化领域集成服务门户(CCPortal): Minimum thermal conductivity in the context of: Diffuson -mediated thermal transport

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DOI	10.1039/c7ee03256k
	Minimum thermal conductivity in the context of: Diffuson -mediated thermal transport
	Agne M.T.; Hanus R.; Snyder G.J.
发表日期	2018
ISSN	17545692
起始页码	609
结束页码	616
卷号	11 期号:3
英文摘要	A model for the thermal conductivity of bulk solids is proposed in the limit of diffusive transport mediated by diffusons as opposed to phonons. This diffusive thermal conductivity, κdiff, is determined by the average energy of the vibrational density of states, ωavg, and the number density of atoms, n. Furthermore, κdiff is suggested as an appropriate estimate of the minimum thermal conductivity for complex materials, such that (at high temperatures):. A heuristic finding of this study is that the experimental ωavg is highly correlated with the Debye temperature, allowing κdiff to be estimated from the longitudinal and transverse speeds of sound: . Using this equation to estimate κmin gives values 37% lower than the widely-used Cahill result and 18% lower than the Clarke model for κmin, on average. This model of diffuson-mediated thermal conductivity may thus help explain experimental results of ultralow thermal conductivity. © The Royal Society of Chemistry 2018.
英文关键词	Chemical industry; Thermal conductivity of solids; Complex materials; Diffusive thermal conductivity; Diffusive transport; High temperature; Highly-correlated; Speeds of sound; Thermal transport; Vibrational density of state; Thermal conductivity; diffusion; equation; experimental study; solid; thermal conductivity
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190287
作者单位	Dept. Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States
推荐引用方式 GB/T 7714	Agne M.T.,Hanus R.,Snyder G.J.. Minimum thermal conductivity in the context of: Diffuson -mediated thermal transport[J],2018,11(3).
APA	Agne M.T.,Hanus R.,&Snyder G.J..(2018).Minimum thermal conductivity in the context of: Diffuson -mediated thermal transport.Energy & Environmental Science,11(3).
MLA	Agne M.T.,et al."Minimum thermal conductivity in the context of: Diffuson -mediated thermal transport".Energy & Environmental Science 11.3(2018).