NDLI: Direct observation of metastable face-centered cubic Sb$_{2}$Te$

Content Provider	Springer Nature Link
Author	Zheng, Yonghui Xia, Mengjiao Cheng, Yan Rao, Feng Ding, Keyuan Liu, Weili Jia, Yu Song, Zhitang Feng, Songlin
Copyright Year	2016
Abstract	Although phase change memory technology has developed drastically in the past two decades, the cognition of the key switching materials still ignores an important member, the face-centered cubic Sb$_{2}$Te$_{3}$. Apart from the well-known equilibrium hexagonal Sb$_{2}$Te$_{3}$ crystal, we prove the metastable face-centered cubic Sb$_{2}$Te$_{3}$ phase does exist. Such a metastable crystal contains a large concentration of vacancies randomly occupying the cationic lattice sites. The face-centered cubic to hexagonal phase transformation of Sb$_{2}$Te$_{3}$, accompanied by vacancy aggregation, occurs at a quite lower temperature compared to that of Ge$_{2}$Sb$_{2}$Te$_{5}$ alloy. We prove that the covalent-like bonds prevail in the metastable Sb$_{2}$Te$_{3}$ crystal, deviating from the ideal resonant features. If a proper doping technique is adopted, the metastable Sb$_{2}$Te$_{3}$ phase could be promising for realizing reversibly swift and low-energy phase change memory applications. Our study may offer a new insight into commercialized Ge–Sb–Te systems and help in the design of novel phase change materials to boost the performances of the phase change memory device.
Starting Page	3453
Ending Page	3462
Page Count	10
File Format	PDF
ISSN	19980124
Journal	Nano Research
Volume Number	9
Issue Number	11
e-ISSN	19980000
Language	English
Publisher	Tsinghua University Press
Publisher Date	2016-08-31
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	phase change memory Sb$_{2}$Te$_{3}$ face-centered cubic TEM ab initio theoretical simulation Nanotechnology Materials Science Atomic/Molecular Structure and Spectra Condensed Matter Physics Biotechnology Biomedicine
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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