Skip to main content

Research Repository

Advanced Search

New Apatite-Type Oxide Ion Conductor, Bi2La8[(GeO4)6]O3: Structure, Properties, and Direct Imaging of Low-Level Interstitial Oxygen Atoms Using Aberration-Corrected Scanning Transmission Electron Microscopy

Tate, Matthew L.; Blom, Douglas A.; Avdeev, Maxim; Brand, Helen E.A.; McIntyre, Garry J.; Vogt, Thomas; Evans, Ivana Radosavljevic

New Apatite-Type Oxide Ion Conductor, Bi2La8[(GeO4)6]O3: Structure, Properties, and Direct Imaging of Low-Level Interstitial Oxygen Atoms Using Aberration-Corrected Scanning Transmission Electron Microscopy Thumbnail


Authors

Matthew L. Tate

Douglas A. Blom

Maxim Avdeev

Helen E.A. Brand

Garry J. McIntyre

Thomas Vogt



Abstract

The new solid electrolyte Bi2La8[(GeO4)6]O3 is prepared and characterized by variable-temperature synchrotron X-ray and neutron diffraction, aberration-corrected scanning transmission electron microscopy, and physical property measurements (impedance spectroscopy and second harmonic generation). The material is a triclinic variant of the apatite structure type and owes its ionic conductivity to the presence of oxide ion interstitials. A combination of annular bright-field scanning transmission electron microscopy experiments and frozen-phonon multislice simulations enables direct imaging of the crucial interstitial oxygen atoms present at a level of 8 out of 1030 electrons per formula unit of the material, and crystallographically disordered, in the unit cell. Scanning transmission electron microscopy also leads to a direct observation of the local departures from the centrosymmetric average structure determined by diffraction. As no second harmonic generation signal is observed, these displacements are non-cooperative on the longer length scales probed by optical methods.

Citation

Tate, M. L., Blom, D. A., Avdeev, M., Brand, H. E., McIntyre, G. J., Vogt, T., & Evans, I. R. (2017). New Apatite-Type Oxide Ion Conductor, Bi2La8[(GeO4)6]O3: Structure, Properties, and Direct Imaging of Low-Level Interstitial Oxygen Atoms Using Aberration-Corrected Scanning Transmission Electron Microscopy. Advanced Functional Materials, 27(8), Article 1605625. https://doi.org/10.1002/adfm.201605625

Journal Article Type Article
Acceptance Date Dec 12, 2016
Online Publication Date Jan 18, 2017
Publication Date Feb 23, 2017
Deposit Date Jan 24, 2017
Publicly Available Date Mar 28, 2024
Journal Advanced Functional Materials
Print ISSN 1616-301X
Electronic ISSN 1616-3028
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 27
Issue 8
Article Number 1605625
DOI https://doi.org/10.1002/adfm.201605625

Files

Accepted Journal Article (709 Kb)
PDF

Copyright Statement
This is the peer reviewed version of the following article: Tate, Matthew L., Blom, Douglas A., Avdeev, Maxim, Brand, Helen E. A., McIntyre, Garry J., Vogt, Thomas & Evans, Ivana Radosavljevic (2017). New Apatite-Type Oxide Ion Conductor, Bi2La8[(GeO4)6]O3: Structure, Properties, and Direct Imaging of Low-Level Interstitial Oxygen Atoms Using Aberration-Corrected Scanning Transmission Electron Microscopy. Advanced Functional Materials, 27(8): 1605625, which has been published in final form at https://doi.org/10.1002/adfm.201605625. This article may be used for non-commercial purposes in accordance With Wiley-VCH Terms and Conditions for self-archiving.





You might also like



Downloadable Citations