Oxygen, solid quadrupole moment

The isotopes Ga and Ga with natural abundances of 60.4% and 39.6%, respectively, are both suitable candidates for solid-state NMR spectroscopy. Since the quadrupole moments of these isotopes have the same order as that of the aluminum nucleus, similar NMR Une shapes can be expected for gallium and aluminum atoms incorporated at analogous framework sites. Moreover, Bradley et al. [152] found a linear relationship between the Ga and Al chemical shifts of a series of structurally analogous aliunimun and gaUiiun compoimds with exclusively oxygen in the first coordination sphere ... 

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