Theoretical prediction and experimental determination of the low lattice thermal conductivity of Lu2SiO5

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	Theoretical prediction and experimental determination of the low lattice thermal conductivity of Lu2SiO5
	Z. L.; Sun Tian, L. C.; Wang, J. M.; Wang, J. Y.
	2015
发表期刊	Journal of the European Ceramic Society
ISSN	0955-2219
卷号	35 期号:6 页码:1923-1932
摘要	In this paper, Lu2SiO5 is reported as a promising rare-earth silicate with very low thermal conductivity. First-principle method is used to calculate the crystal structure, second order elastic constants and anisotropic elastic stiffness. Using these parameters, the whole profile of temperature dependent lattice thermal conductivity of Lu2SiO5 is predicted based on well-established models. The low lattice thermal conductivity of Lu2SiO5 originates from its complex crystal structure, significant bonding heterogeneity, low Debye temperature, and low sound velocity. Experimental intrinsic lattice thermal conductivity is also determined by successfully eliminating the extrinsic mechanisms for phonon scattering by point defects and grain boundaries, as well as the contribution of thermal radiation at high temperatures, from the measured lattice thermal diffusivity. The experimental result agrees well with theoretical prediction. The present method can illustrate how specific material parameters govern lattice thermal conductivity and provide quantitative guideline in searching novel candidates with low thermal conductivity. (C) 2015 Elsevier Ltd. All rights reserved.
部门归属	[tian, zhilin ; sun, luchao ; wang, jiemin ; wang, jingyang] chinese acad sci, inst met res, shenyang natl lab mat sci, highperformance ceram div, shenyang 110016, peoples r china. [tian, zhilin] univ chinese acad sci, beijing 100049, peoples r china. ; wang, jy (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, highperformance ceram div, shenyang 110016, peoples r china. ; jywang@imr.ac.cn
关键词	Rare-earth Silicates Low Thermal Conductivity Simulation Experimental Single-crystal Elastic Stiffness High Temperatures Barrier Coatings Resistance Ceramics
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73937
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. L.,Sun Tian, L. C.,Wang, J. M.,et al. Theoretical prediction and experimental determination of the low lattice thermal conductivity of Lu2SiO5[J]. Journal of the European Ceramic Society,2015,35(6):1923-1932.
APA	Z. L.,Sun Tian, L. C.,Wang, J. M.,&Wang, J. Y..(2015).Theoretical prediction and experimental determination of the low lattice thermal conductivity of Lu2SiO5.Journal of the European Ceramic Society,35(6),1923-1932.
MLA	Z. L.,et al."Theoretical prediction and experimental determination of the low lattice thermal conductivity of Lu2SiO5".Journal of the European Ceramic Society 35.6(2015):1923-1932.