High entropy(Yb0.25Y0.25Lu0.25Er0.25)2SiO5 with strong anisotropy in thermal expansion

查看全文 作　　者：Heng [1,2]Chen;Huimin [2]Xiang;Fu-Zhi [2]Dai;Jiachen [1]Liu;Yanchun [2]Zhou

机构地区：[1]Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education,School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China;[2]Science and Technology on Advanced Functional Composite Laboratory,Aerospace Research Institute of Materials&Processing Technology,Beijing 100076,China

出　　处：《Journal of Materials Science & Technology》索引2020年第36卷第1期,共6页

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51672064andU1435206)。 摘　　要：A novel high entropy(HE) rare earth monosilicate(Yb0.25Y0.25Lu0.25Er0.252 SiO5 was synthesized by solid-state reaction method.X-ray diffraction and scanning electron microscopy analysis indicate that a single solid solution is formed with homogeneous distribution of rare-earth elements.HE(Yb0.25Y0.25Lu0.255 Er0.252 SiO5 exhibits excellent phase stability and anisotropy in thermal expansion.The coefficients of thermal expansion(CTEs) in three crystallographic directions are:αa=(2.57±0.07)×10^-6 K^-1,αb=(8.07±0.13)×10^-6 K^-1,αc=(9.98±0.10)×10^-6 K^-1.The strong anisotropy in thermal expansion is favorable in minimizing the coating/substrate mismatch if preferred orientation of HE(Yb0.25Y0.25Lu0.25Er0.252 SiO5 is controlled on either metal or ceramic substrate. 关键词：HIGH ENTROPY ceramics Rare earth monosilicates SOLID-STATE reaction Thermal EXPANSION ANISOTROPY

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High entropy(Yb0.25Y0.25Lu0.25Er0.25)2SiO5 with strong anisotropy in thermal expansion

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