Fast Atomic-Scale Chemical Imaging of Crystalline Materials and Dynamic Phase Transformations [electronic resource].
- Published
- Washington, D.C. : United States. National Nuclear Security Administration, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy - Physical Description
- pages 2,728-2,733 : digital, PDF file
- Additional Creators
- Sandia National Laboratories, United States. National Nuclear Security Administration, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access
- Free-to-read Unrestricted online access
- Summary
- Chemical imaging at the atomic-scale provides a useful real-space approach to chemically investigate solid crystal structures, and has been recently demonstrated in aberration corrected scanning transmission electron microscopy (STEM). Atomic-scale chemical imaging by STEM using energy-dispersive X-ray spectroscopy (EDS) offers easy data interpretation with a one-to-one correspondence between image and structure but has a severe shortcoming due to the poor efficiency of X-ray generation and collection. As a result, it requires a long acquisition time of typical > few 100 seconds, limiting its potential applications. Here we describe the development of an atomic-scale STEM EDS chemical imaging technique that cuts the acquisition time to one or a few seconds, efficiently reducing the acquisition time by more than 100 times. This method was demonstrated using LaAlO3 (LAO) as a model crystal. Applying this method to the study of phase transformation induced by electron-beam radiation in a layered lithium transition-metal (TM) oxide, i.e., Li[Li0.2Ni0.2Mn0.6]O2 (LNMO), a cathode materials for lithium-ion batteries, we obtained a time-series of the atomic-scale chemical imaging, showing the transformation progressing by preferably jumping of Ni atoms from the TM layers into the Li-layers. The new capability offers an opportunity for temporal, atomic-scale chemical mapping of crystal structures for the investigation of materials susceptible to electron irradiation as well as phase transformation and dynamics at the atomic-scale.
- Report Numbers
- E 1.99:sand--2015-11024j
sand--2015-11024j - Subject(s)
- Note
- Published through SciTech Connect.
03/04/2016.
"sand--2015-11024j"
"617445"
Nano Letters 16 4 ISSN 1530-6984 AM
Ping Lu; Ren Liang Yuan; Jon F. Ihlefeld; Erik David Spoerke; Wei Pan; Jian Min Zuo. - Funding Information
- AC04-94AL85000
View MARC record | catkey: 24056125