| Local structural changes during the disordered substitutional alloy transition in Bi2Te3 by high-pressure XAFS | |
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); Zhao YD(赵屹东); Li XD(李晓东); Chen DL(陈栋梁); Guo, ZY; Zhu, HL; Dong, JC; Jia, QJ; Gong, Y; Wang, Y; Li, HJ; An, PF; Yang, DL; Zhao, YD; Xing, HY; Li, XD; Chen, DL
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| 2018 | |
| Source Publication | JOURNAL OF APPLIED PHYSICS
 |
| ISSN | 0021-8979 |
| EISSN | 1089-7550 |
| Volume | 124Issue:6Pages:65901 |
| Subtype | Article |
| Abstract | 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. |
| DOI | 10.1063/1.5042457 |
| WOS Keyword | TOPOLOGICAL INSULATORS ; SB2TE3 ; SPECTROSCOPY ; BI2SE3 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS Research Area | Physics |
| WOS Subject | Physics, Applied |
| WOS ID | WOS:000441671600056 |
| EI Accession Number | 20183305702020 |
| ADS Bibcode | 2018JAP...124f5901G |
| Citation statistics |
Cited Times:6 [ADS]
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| Document Type | 期刊论文 |
| Identifier | http://ir.ihep.ac.cn/handle/311005/286211 |
| Collection | 多学科研究中心 实验物理中心 |
| Corresponding Author | Chen DL(陈栋梁) |
| Affiliation | 中国科学院高能物理研究所 |
| First Author Affilication | Institute of High Energy |
| Corresponding Author Affilication | Institute of High Energy |
| Recommended Citation GB/T 7714 | Guo ZY,Zhu HL,Dong JC,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 | 郭志英.,朱海亮.,董俊才.,贾全杰.,宫宇.,...&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 | 郭志英,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. |
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