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Title: Polarity compensation mechanisms on the perovskite surface KTaO 3(001)

Abstract

The stacking of alternating charged planes in ionic crystals creates a diverging electrostatic energy—a “polar catastrophe”—that must be compensated at the surface. We used scanning probe microscopies and density functional theory to study compensation mechanisms at the perovskite potassium tantalate (KTaO 3) (001) surface as increasing degrees of freedom were enabled. The as-cleaved surface in vacuum is frozen in place but immediately responds with an insulator-to-metal transition and possibly ferroelectric lattice distortions. Annealing in vacuum allows the formation of isolated oxygen vacancies, followed by a complete rearrangement of the top layers into an ordered pattern of KO and TaO 2 stripes. The optimal solution is found after exposure to water vapor through the formation of a hydroxylated overlayer with ideal geometry and charge.

Authors:
 [1];  [2];  [1];  [1];  [1]; ORCiD logo [3];  [2];  [1]
  1. Technische Univ. Wien, Vienna (Austria)
  2. Univ. of Vienna (Austria)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1429191
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Science
Additional Journal Information:
Journal Volume: 359; Journal Issue: 6375; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Setvin, Martin, Reticcioli, Michele, Poelzleitner, Flora, Hulva, Jan, Schmid, Michael, Boatner, Lynn A., Franchini, C., and Diebold, U. Polarity compensation mechanisms on the perovskite surface KTaO3(001). United States: N. p., 2018. Web. doi:10.1126/science.aar2287.
Setvin, Martin, Reticcioli, Michele, Poelzleitner, Flora, Hulva, Jan, Schmid, Michael, Boatner, Lynn A., Franchini, C., & Diebold, U. Polarity compensation mechanisms on the perovskite surface KTaO3(001). United States. doi:10.1126/science.aar2287.
Setvin, Martin, Reticcioli, Michele, Poelzleitner, Flora, Hulva, Jan, Schmid, Michael, Boatner, Lynn A., Franchini, C., and Diebold, U. Fri . "Polarity compensation mechanisms on the perovskite surface KTaO3(001)". United States. doi:10.1126/science.aar2287. https://www.osti.gov/servlets/purl/1429191.
@article{osti_1429191,
title = {Polarity compensation mechanisms on the perovskite surface KTaO3(001)},
author = {Setvin, Martin and Reticcioli, Michele and Poelzleitner, Flora and Hulva, Jan and Schmid, Michael and Boatner, Lynn A. and Franchini, C. and Diebold, U.},
abstractNote = {The stacking of alternating charged planes in ionic crystals creates a diverging electrostatic energy—a “polar catastrophe”—that must be compensated at the surface. We used scanning probe microscopies and density functional theory to study compensation mechanisms at the perovskite potassium tantalate (KTaO3) (001) surface as increasing degrees of freedom were enabled. The as-cleaved surface in vacuum is frozen in place but immediately responds with an insulator-to-metal transition and possibly ferroelectric lattice distortions. Annealing in vacuum allows the formation of isolated oxygen vacancies, followed by a complete rearrangement of the top layers into an ordered pattern of KO and TaO2 stripes. The optimal solution is found after exposure to water vapor through the formation of a hydroxylated overlayer with ideal geometry and charge.},
doi = {10.1126/science.aar2287},
journal = {Science},
number = 6375,
volume = 359,
place = {United States},
year = {2018},
month = {2}
}

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Figures / Tables:

Fig. 1 Fig. 1: Cleaved KTaO3(001). (A) Overview STM image of a surface prepared by cleaving at T = 261 K. (B) Atomically resolved AFM image. (C) STS spectra measured above the KO and TaO2 terraces. (D) Atomic structure of the TaO2 and KO terraces and a schematic drawing of the cleaving.more » (E) Spatial distribution of in-gap states, measured in the region marked by a dashed square in (A). Dashed lines mark steps. (F) KPFM image of a different region, showing the local electrostatic surface potential.« less

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    Works referencing / citing this record:

    Water oxidation catalysis on reconstructed NaTaO 3 (001) surfaces
    journal, January 2019

    • Ouhbi, Hassan; Aschauer, Ulrich
    • Journal of Materials Chemistry A, Vol. 7, Issue 28
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    Water oxidation catalysis on reconstructed NaTaO 3 (001) surfaces
    journal, January 2019

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