Energetic Ion Irradiation-Induced Disordered Nanochannels for Fast Ion Conduction

Sachan, Ritesh; Chisholm, Matthew F.; Ou, Xin; Zhang, Yanwen; Weber, William J.

doi:10.1007/s11837-018-3171-y

Title: Energetic Ion Irradiation-Induced Disordered Nanochannels for Fast Ion Conduction

Journal Article · 07 October 2018 · JOM. Journal of the Minerals, Metals & Materials Society

DOI: https://doi.org/10.1007/s11837-018-3171-y · OSTI ID:1489562

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Army Research Office, Research Triangle Park, NC (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Chinese Academy of Sciences, Shanghai (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

We report that atomically disordered oxides are seen as suitable candidate for fast oxygen conduction due to their remarkable enhancement in oxygen diffusivity compared with ordered oxides. In particular, disordered derivatives of pyrochlore-structured oxides (A₂B₂O₇) are seen as an interesting prospect due to the intrinsic existence of oxygen vacancies in their lattice. Using energetic ion irradiation, we demonstrated fabrication of structurally disordered nanoscale channels in A₂B₂O₇ (A = Gd, Yb; B = Ti, Zr) that act as selective pathways for fast oxygen conduction. Atomic-level characterization revealed that the amorphous core and surrounding defect-fluorite phase in the nanochannels exhibited distorted and differently coordinated Ti-O polyhedra, with very similar electronic structure. Lastly, the formation of defect-fluorite structure is facilitated by a decrease in the difference between the ionic radii of A- and B-site cations in the lattice.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1489562

Journal Information:: JOM. Journal of the Minerals, Metals & Materials Society, Journal Name: JOM. Journal of the Minerals, Metals & Materials Society Journal Issue: 1 Vol. 71; ISSN 1047-4838

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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