Defect-mediated multiple-enhancement of phonon scattering and decrement of thermal conductivity in (YxYb1-x)(2)SiO5 solid solution

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	Defect-mediated multiple-enhancement of phonon scattering and decrement of thermal conductivity in (YxYb1-x)(2)SiO5 solid solution
	Tian, ZL; Lin, CF; Zheng, LY; Sun, LC; Li, JL; Wang, JY; Wang, JY (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
刊名	ACTA MATERIALIA
	2018-02-01
卷号	144 页码:292-304
关键词	Yttria-stabilized Zirconia Barrier-coating Applications High Temperatures Nitride Ceramics Single-crystal Youngs Modulus Yb Luminescence Composites Resistance
ISSN号	1359-6454
英文摘要	Rare earth (RE) silicates are promising candidates for environmental and thermal barrier coating (ETBC) materials. Low thermal conductivity is one of the main concerned thermal properties in ETBC design. We herein adopted multiple phonon scattering mechanisms to lower thermal conductivity of (YxYb1-x)(2)SiO5 solid solutions. Bulk samples were prepared by hot pressing method and RE atomic occupations, Raman spectra, thermal conductivities were measured as well as Debye temperature was obtained from temperature dependent Young's modulus. It is interesting to note that huge mass and size misfits between Yb and Y ions dominate the decrement of thermal conductivity. Furthermore, Yb2+ increases the concentration of oxygen vacancy, and it further decreases heat conduction. This work highlights the possible defect engineering in RE silicates for their advances in ETBC applications. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; Rare earth (RE) silicates are promising candidates for environmental and thermal barrier coating (ETBC) materials. Low thermal conductivity is one of the main concerned thermal properties in ETBC design. We herein adopted multiple phonon scattering mechanisms to lower thermal conductivity of (YxYb1-x)(2)SiO5 solid solutions. Bulk samples were prepared by hot pressing method and RE atomic occupations, Raman spectra, thermal conductivities were measured as well as Debye temperature was obtained from temperature dependent Young's modulus. It is interesting to note that huge mass and size misfits between Yb and Y ions dominate the decrement of thermal conductivity. Furthermore, Yb2+ increases the concentration of oxygen vacancy, and it further decreases heat conduction. This work highlights the possible defect engineering in RE silicates for their advances in ETBC applications. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
学科主题	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	National Key R&D Program of China [2017YFB0703201]; Natural Science Foundation of China [5137225, 51772302]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79548]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, JY (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Tian, ZL,Lin, CF,Zheng, LY,et al. Defect-mediated multiple-enhancement of phonon scattering and decrement of thermal conductivity in (YxYb1-x)(2)SiO5 solid solution[J]. ACTA MATERIALIA,2018,144:292-304.
APA	Tian, ZL.,Lin, CF.,Zheng, LY.,Sun, LC.,Li, JL.,...&Wang, JY .(2018).Defect-mediated multiple-enhancement of phonon scattering and decrement of thermal conductivity in (YxYb1-x)(2)SiO5 solid solution.ACTA MATERIALIA,144,292-304.
MLA	Tian, ZL,et al."Defect-mediated multiple-enhancement of phonon scattering and decrement of thermal conductivity in (YxYb1-x)(2)SiO5 solid solution".ACTA MATERIALIA 144(2018):292-304.