Probing oxygen motion in disordered anionic conductors with 17O and 51V MAS NMR spectroscopy

被引:63
作者
Kim, N [1 ]
Grey, CP [1 ]
机构
[1] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA
关键词
D O I
10.1126/science.1074130
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 O-17 magic angle spinning nuclear magnetic resonance (MAS NMR) spectra may be obtained even from the highly disordered, layered materials alpha-Bi4V2O11 and beta-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 O-17 NMR spectra, and correlation times for motion were estimated. Double-resonance O-17/V-51 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.
引用
收藏
页码:1317 / 1320
页数:5
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