Solid-State 93Nb NMR and 93Nb Nutation Studies of Polycrystalline Pb(Mg1/3Nb2/3)O3 and (1 - x)Pb(Mg1/3Nb2/3)O3/xPbTiO3 Solid-Solution Relaxor Ferroelectrics

Solid-state 93Nb static and MAS NMR and 93Nb nutation studies of polycrystalline Pb(Mg1/3Nb2/3)O3, (PMN) and (1 − x)Pb(Mg1/3Nb2/3)O3/xPbTiO3 (x = 0.05 to 0.50) solid-solutions are reported. The 93Nb static and MAS NMR spectra of PMN measured at 14.1 T have two major resonances due to the central transition (1/2 ↔ −1/2), a sharp peak at −902 ppm (1950 Hz fwhh) and a broad resonance (12 800 Hz fwhh) centered at −980 ppm. Two-dimensional 93Nb nutation spectra measured at 9.4 T, by contrast, have three different resonances, a sharp peak due to niobiums with a CQ 62 MHz, respectively, that are associated with the broad 93Nb peak centered at −980 ppm. The sharp 93Nb peak for PMN is assigned to Nb(V) B-sites of cubic or high local symmetry in Mg(II)-rich regions with Nb(OMg)6 configurations. The broad 93Nb resonance at −980 ppm is assigned to a range of Nb(ONb)6-x(OMg)x site co...