O MAS NMR study of the oxygen local environments in the anionic conductors Y2(B1−xB′x)2O7(B, B′=Sn, Ti, Zr) |
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Authors: | Namjun Kim |
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Affiliation: | Department of Chemistry, State University of New York at Stony Brook, Stony Brook, NY 11794-3400, USA |
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Abstract: | The local environments for oxygen in yttrium-containing pyrochlores and fluorites, Y2(B1−xB′x)2O7 (B=Ti, B′=Sn, Zr) are investigated by using solid state 17O MAS NMR spectroscopy. The quadrupolar coupling constants of the nucleus, 17O are sufficiently small for these ionic oxides, that high-resolution spectra are obtained from the MAS spectra. Different oxygen NMR resonances are observed due to local environments with differing numbers of metal cations (Y3+, Sn4+, Ti4+ and Zr4+), allowing the numbers of different local environments to be quantified and cation mixing to be investigated. Evidence for pyrochlore-like local ordering is detected for Y2Zr2O7, which nominally adopts the fluorite structure. |
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Keywords: | Solid state NMR Oxide ionic conductor Pyrochlore Fluorite Y2Zr2O7 Y2Sn2O7 Y2Ti2O7 |
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