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

doi:10.1016/j.mtphys.2022.100961

IMR OpenIR

	Atomic structural visualization on gamma-Ho2Si2O7 using iDPC-STEM technique and its correlation with thermal expansion as advanced environmental barrier coating
	Lv, Xirui; Luo, Yixiu; Cui, Jingping; Zhang, Jie; Zhang, Lei; Wang, Jingyang
通讯作者	Cui, Jingping(jpcui@imr.ac.cn) ; Zhang, Jie(jiezhang@imr.ac.cn)
	2023
发表期刊	MATERIALS TODAY PHYSICS
ISSN	2542-5293
卷号	30 页码:6
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.
关键词	RE disilicate Thermal expansion Integrated differential phase contrast Imaging technique Environmental barrier coatings
资助者	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
DOI	10.1016/j.mtphys.2022.100961
收录类别	SCI
语种	英语
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
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied
WOS记录号	WOS:000918297800001
出版者	ELSEVIER
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/175306
专题	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.