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Atomic structural visualization on gamma-Ho2Si2O7 using iDPC-STEM technique and its correlation with thermal expansion as advanced environmental barrier coating

文献类型：期刊论文

作者Lv, Xirui; Luo, Yixiu; Cui, Jingping; Zhang, Jie; Zhang, Lei; Wang, Jingyang
刊名MATERIALS TODAY PHYSICS
出版日期2023
卷号30页码:6
关键词RE disilicate Thermal expansion Integrated differential phase contrast Imaging technique Environmental barrier coatings
ISSN号2542-5293
DOI10.1016/j.mtphys.2022.100961
通讯作者Cui, Jingping(jpcui@imr.ac.cn) ; Zhang, Jie(jiezhang@imr.ac.cn)
英文摘要gamma-Ho2Si2O7 has attracted considerable attention as advanced environmental barrier coating (EBC) material for SiCf/SiC CMC due to its matchable thermal expansion coefficient (CTE) with Si-based ceramics. Negative pho-nons anharmonicity driven by crystal structure are thought to play a significant role in its thermal expansion behavior. In this work, atomic vibrations of gamma-Ho2Si2O7 are investigated by ab-initio molecular dynamics simulation, Raman, and infrared spectra. The results confirm that transverse vibration of bridge O atoms in rigid [Si2O7] units with linear configuration assure negative contribution to thermal expansion during thermal cycling. Moreover, atomic visualization is achieved by integrated differential phase contrast (iDPC)-STEM technique, and both heavy (Ho) and light (Si, O) atoms in gamma-Ho2Si2O7 are clearly discerned. The acquired images provide a direct understanding to the origin of above mechanisms by capturing projection of all atomic columns along [100]. This work provides new insights into investigation of RE silicates through structural visualization and will facilitate the material design for advanced EBCs.
资助项目National Natural Science Foundation of China[U21A2063] ; National Natural Science Foundation of China[52002376] ; National Key R & D Program of China[2021YFB3702300] ; National Science and Technology Major Project[2017 -VI -0020-0093] ; Chinese Academy of Sciences ; LiaoNing Revitalization Talents Program[2020 -MS -006] ; Natural Science Foundation of Liaoning Province[ZDRW - CN - 2021-2-2] ; [XLYC2002018]
WOS研究方向Materials Science ; Physics
语种英语
WOS记录号WOS:000918297800001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Key R & D Program of China ; National Science and Technology Major Project ; Chinese Academy of Sciences ; LiaoNing Revitalization Talents Program ; Natural Science Foundation of Liaoning Province
源URL[http://ir.imr.ac.cn/handle/321006/175305]  
专题金属研究所_中国科学院金属研究所
通讯作者Cui, Jingping; Zhang, Jie
作者单位Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang, Peoples R China
推荐引用方式
GB/T 7714		 Lv, Xirui,Luo, Yixiu,Cui, Jingping,et al. Atomic structural visualization on gamma-Ho2Si2O7 using iDPC-STEM technique and its correlation with thermal expansion as advanced environmental barrier coating[J]. MATERIALS TODAY PHYSICS,2023,30:6.
APA Lv, Xirui,Luo, Yixiu,Cui, Jingping,Zhang, Jie,Zhang, Lei,&Wang, Jingyang.(2023).Atomic structural visualization on gamma-Ho2Si2O7 using iDPC-STEM technique and its correlation with thermal expansion as advanced environmental barrier coating.MATERIALS TODAY PHYSICS,30,6.
MLA Lv, Xirui,et al."Atomic structural visualization on gamma-Ho2Si2O7 using iDPC-STEM technique and its correlation with thermal expansion as advanced environmental barrier coating".MATERIALS TODAY PHYSICS 30(2023):6.

入库方式： OAI收割

来源：金属研究所

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