Abstract
Small additive shifts due to changes in the local environment of the resonating nucleus have been observed in magic-angle spinning nuclear magnetic resonance (MASNMR) studies of several classes of solid. The 29.Si resonances in zeolites, for example, shift by approximately 5 p.p.m. per aluminium next-nearest-neighbour1,2, and similar effects have been observed in 31P MASNMR spectra of Zn3−xMgx (PO4)2 solid solutions3. The use of paramagnetic ions to induce large chemical shifts is well established in solution NMR4 and has also been observed for molecular structures in the solid state5. Here we describe a 119Sn study of the pyrochlore solid solution, Y2−xSmx,Sn2O7, and show for the first time the use of paramagnetic shifts in MASNMR to probe the structures of continuous solids.
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Cheetham, A., Dobson, C., Grey, C. et al. Paramagnetic shift probes in high-resolution solid-state NMR. Nature 328, 706–707 (1987). https://doi.org/10.1038/328706a0
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DOI: https://doi.org/10.1038/328706a0
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