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.
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.
|Full text:||(AM) Accepted Manuscript|
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|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.|
|Date accepted:||12 December 2016|
|Date deposited:||24 January 2017|
|Date of first online publication:||18 January 2017|
|Date first made open access:||18 January 2018|
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