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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. and Blom, Douglas A. and Avdeev, Maxim and Brand, Helen E. A. and McIntyre, Garry J. and Vogt, Thomas and 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). p. 1605625.

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.

Item Type:Article
Full text:(AM) Accepted Manuscript
First Live Deposit - 24 January 2017
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1002/adfm.201605625
Publisher 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.
Record Created:24 Jan 2017 09:58
Last Modified:21 Jan 2018 00:52

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