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This content will become publicly available on April 29, 2018

Title: Quantitative comparison of bright field and annular bright field imaging modes for characterization of oxygen octahedral tilts

Octahedral tilt behavior is increasingly recognized as an important contributing factor to the physical behavior of perovskite oxide materials and especially their interfaces, necessitating the development of high-resolution methods of tilt mapping. There are currently two major approaches for quantitative imaging of tilts in scanning transmission electron microscopy (STEM), bright field (BF) and annular bright field (ABF). In this study, we show that BF STEM can be reliably used for measurements of oxygen octahedral tilts. While optimal conditions for BF imaging are more restricted with respect to sample thickness and defocus, we find that BF imaging with an aberration-corrected microscope with the accelerating voltage of 300 kV gives us the most accurate quantitative measurement of the oxygen column positions. Using the tilted perovskite structure of BiFeO 3 (BFO) as our test sample, we simulate BF and ABF images in a wide range of conditions, identifying the optimal imaging conditions for each mode. Finally, we show that unlike ABF imaging, BF imaging remains directly quantitatively interpretable for a wide range of the specimen mistilt, suggesting that it should be preferable to the ABF STEM imaging for quantitative structure determination.
 [1] ;  [2] ;  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Sungkyunkwan Univ., Suwon (Korea, Republic of); Inst. for Basic Science (IBS), Suwon (Korea, Republic of)
  2. National Univ. of Singapore (Singapore)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; IBS-R011-D1; NRF-2015M3D1A1070672
Accepted Manuscript
Journal Name:
Additional Journal Information:
Journal Volume: 181; Journal ID: ISSN 0304-3991
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Inst. for Basic Science (Korea, Republic of); National Research Foundation of Korea (NRF)
Country of Publication:
United States
36 MATERIALS SCIENCE; bright field; STEM; perovskite; transition metal oxide; oxygen imaging; octahedral tilt; BiFeO3
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1396515