Abstract
The combined effect from the 51V quadrupole coupling and chemical shielding anisotropy (CSA) has been characterized for five orthovanadates (Mg3(VO4)2, Zn3(VO4)2, BiVO4, TaVO5, NbVO5) and two metavanadates (RbVO3 and CsVO3) employing 51V magic-angle spinning (MAS) NMR of the central and satellite transitions. Furthermore, five metavanadates studied earlier (MVO3 where M = Li, Na, NH4, Tl, K) have been reinvestigated using rotor-stabilized MAS NMR, which improves the reliability of the spinning sideband (ssb) intensities. The complete manifolds of ssbs from all seven single-quantum transitions, observed in the MAS NMR spectra, have been analyzed using least-squares fitting and numerical error analysis. The optimized data demonstrate that for the metavanadates the magnitudes of the quadrupole and shielding anisotropy tensors (i.e., CQ, ηQ, δσ, ησ) and of the Euler angle, which relates the principal element of the two tensors, can be determined with high precision. Somewhat larger error limits are observed f...
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