Direct Observation of Sr Vacancies in SrTiO 3 by Quantitative Scanning Transmission Electron Microscopy

Kim, Honggyu; Zhang, Jack Y.; Raghavan, Santosh; Stemmer, Susanne

doi:10.1103/PhysRevX.6.041063

Title: Direct Observation of Sr Vacancies in ${SrTiO}_{3}$ by Quantitative Scanning Transmission Electron Microscopy

Journal Article · Thu Dec 22 00:00:00 EST 2016 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.6.041063· OSTI ID:1337451

Kim, Honggyu; Zhang, Jack Y.; Raghavan, Santosh; Stemmer, Susanne

Unveiling the identity, spatial configuration, and microscopic structure of point defects is one of the key challenges in materials science. Here, we demonstrate that quantitative scanning transmission electron microscopy (STEM) can be used to directly observe Sr vacancies in SrTiO₃ and to determine the atom column relaxations around them. By combining recent advances in quantitative STEM, including variableangle, high-angle annular dark-field imaging and rigid registration methods, with frozen phonon multislice image simulations, we identify which Sr columns contain vacancies and quantify the number of vacancies in them. Here, picometer precision measurements of the surrounding atom column positions show that the nearest-neighbor Ti atoms are displaced away from the Sr vacancies. The results open up a new methodology for studying the microscopic mechanisms by which point defects control materials properties.

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Research Organization:: Univ. of California, Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-02ER45994

OSTI ID:: 1337451

Alternate ID(s):: OSTI ID: 1361394

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 6 Journal Issue: 4; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 37 works

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