Abstract
This chapter discusses the paramagnetic effect of oxygen in the sodium ( 23 Na) magic angle spinning nuclear magnetic resonance (MAS NMR) and 23 Na multiple-quantum magic angle spinning (MQMAS) NMR spectra of LiNaX. The presence of the oxygen causes a downfield paramagnetic shift for the site III resonance, although smaller than what is expected. 23 Na MQMAS NMR is used to calculate isotropic chemical shifts and 2 nd order quadrupolar shifts. The quadrupolar shifts of the room temperature sodium resonance remain same irrespective of the presence or absence of physisorbed oxygen; however, the quadrupolar shift is found to increase at lower temperatures.
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