Local structural changes during the disordered substitutional alloy transition in Bi2Te3 by high-pressure XAFS

doi:10.1063/1.5042457

	Local structural changes during the disordered substitutional alloy transition in Bi2Te3 by high-pressure XAFS
	Jia, QJ; Guo ZY(郭志英); Zhu HL(朱海亮); Dong JC(董俊才); Jia QJ(贾全杰); Gong Y(宫宇); Wang Y(王研); Li HJ(李海静); An PF(安鹏飞); Yang DL(杨栋亮)
刊名	JOURNAL OF APPLIED PHYSICS
	2018
卷号	124 期号:6 页码:65901
ISSN号	0021-8979
DOI	10.1063/1.5042457
文献子类	Article
英文摘要	A(2)B(3)-type 3D topological insulators, Bi2Te3 and Sb2Te3, have been reported to transform into disordered substitutional alloys under high pressure. However, gamma > delta phase transition and the local structure changes around Bi during the formation of the disordered Bi-Te binary alloy in Bi2Te3 still remain unclear. Here, high-pressure X-ray absorption fine structure (XAFS) combined with high-pressure X-ray diffraction has been used to explore the local structural transformations in the three structural phase transitions of Bi2Te3. The Bi L-3-X-ray absorbing near edge structure (XANES) spectra of delta-Bi2Te3 clearly showed that a new absorption feature at energy of about 13 465 eV would emerge during the gamma > delta phase transition. Through simulation of the XANES spectra by varying the cluster size, we confirmed that the new absorption peak arises from the medium-range order in bcc structure. The Bi L-3-EXAFS results in delta phase reveal that the Bi atoms in the third shell exhibit abnormal elongations with pressure until merging with the shrinking Te shell. Our findings indicate a two-step structural transition of the disordered substitutional alloys via an ordered bcc intermediate phase. Published by AIP Publishing.
电子版国际标准刊号	1089-7550
WOS关键词	TOPOLOGICAL INSULATORS ; SB2TE3 ; SPECTROSCOPY ; BI2SE3
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000441671600056
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/286211]
专题	高能物理研究所_多学科研究中心高能物理研究所_实验物理中心
通讯作者	Chen DL(陈栋梁)
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Jia, QJ,Guo ZY,Zhu HL,et al. Local structural changes during the disordered substitutional alloy transition in Bi2Te3 by high-pressure XAFS[J]. JOURNAL OF APPLIED PHYSICS,2018,124(6):65901.
APA	Jia, QJ.,郭志英.,朱海亮.,董俊才.,贾全杰.,...&Chen, DL.(2018).Local structural changes during the disordered substitutional alloy transition in Bi2Te3 by high-pressure XAFS.JOURNAL OF APPLIED PHYSICS,124(6),65901.
MLA	Jia, QJ,et al."Local structural changes during the disordered substitutional alloy transition in Bi2Te3 by high-pressure XAFS".JOURNAL OF APPLIED PHYSICS 124.6(2018):65901.