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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
Source PublicationJournal of the European Ceramic Society
ISSN0955-2219
Volume35Issue:6Pages:1923-1932
AbstractIn 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.
description.department[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
KeywordRare-earth Silicates Low Thermal Conductivity Simulation Experimental Single-crystal Elastic Stiffness High Temperatures Barrier Coatings Resistance Ceramics
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73937
Collection中国科学院金属研究所
Recommended Citation
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.
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