Probing oxygen motion in disordered anionic conductors with 17O and 51V MAS NMR spectroscopy.
Identification of the local environments of the ions in a solid-state electrolyte that contribute to the ionic conductivity or remain trapped in the lattice represents a challenge for many experimental probes of structure. We show that high-resolution 17O magic angle spinning nuclear magnetic resonance (MAS NMR) spectra may be obtained even from the highly disordered, layered materials alpha-Bi4V2O11 and gamma-Bi4V1.7Ti0.3O10.85, in which the different oxide sites in the lattice may be distinguished. The sites responsible for anionic conduction were determined directly from the variable-temperature 17O NMR spectra, and correlation times for motion were estimated. Double-resonance 17O/51V NMR methods were used as confirmation of the assignments of the resonances and as a second experimental probe of motion that is sensitive to mobility involving oxide ion hops between the same crystallographic sites.
Department of Chemistry, State University of New York at Stony Brook, Stony Brook, NY 11794-3400, USA.
Namjun
N
Kim
Clare P
CP
Grey