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Title: Fast Atomic-Scale Chemical Imaging of Crystalline Materials and Dynamic Phase Transformations

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 LaAlO 3 (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[Li 0.2Ni 0.2Mn 0.6]O 2 (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 chemicalmore » mapping of crystal structures for the investigation of materials susceptible to electron irradiation as well as phase transformation and dynamics at the atomic-scale.« less
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Univ. of Illinois, Urbana-Champaign, IL (United States)
Publication Date:
Report Number(s):
SAND-2015-11024J
Journal ID: ISSN 1530-6984; 617445
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 16; Journal Issue: 4; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1427226

Lu, Ping, Yuan, Ren Liang, Ihlefeld, Jon F., Spoerke, Erik David, Pan, Wei, and Zuo, Jian Min. Fast Atomic-Scale Chemical Imaging of Crystalline Materials and Dynamic Phase Transformations. United States: N. p., Web. doi:10.1021/acs.nanolett.6b00401.
Lu, Ping, Yuan, Ren Liang, Ihlefeld, Jon F., Spoerke, Erik David, Pan, Wei, & Zuo, Jian Min. Fast Atomic-Scale Chemical Imaging of Crystalline Materials and Dynamic Phase Transformations. United States. doi:10.1021/acs.nanolett.6b00401.
Lu, Ping, Yuan, Ren Liang, Ihlefeld, Jon F., Spoerke, Erik David, Pan, Wei, and Zuo, Jian Min. 2016. "Fast Atomic-Scale Chemical Imaging of Crystalline Materials and Dynamic Phase Transformations". United States. doi:10.1021/acs.nanolett.6b00401. https://www.osti.gov/servlets/purl/1427226.
@article{osti_1427226,
title = {Fast Atomic-Scale Chemical Imaging of Crystalline Materials and Dynamic Phase Transformations},
author = {Lu, Ping and Yuan, Ren Liang and Ihlefeld, Jon F. and Spoerke, Erik David and Pan, Wei and Zuo, Jian Min},
abstractNote = {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.},
doi = {10.1021/acs.nanolett.6b00401},
journal = {Nano Letters},
number = 4,
volume = 16,
place = {United States},
year = {2016},
month = {3}
}