- Eﬀectiveness of high magnetic ﬁelds in high-resolution solid-state NMR:II. Case of inorganic compounds
Eﬀectiveness of high magnetic ﬁelds in high-resolution solid-state NMR:II. Case of inorganic compounds
Solid-state NMR of half-integer spins, such as 11B(I=3/2), 23Na(I=3/2), and 27Al(I=5/2), is getting important in inorganic material science. NMR signals of these nuclei may be broad due to quadrupolar interactions, leading to diﬃculties in spectral analysis.
Quadrupolar interactions, however, become smaller in inverse proportion to magnetic ﬁelds, resulting in sharp resonance lines and simple spectra.
Fig. 1 shows resolution enhancement along with magnetic ﬁelds: AlPO4 exhibits three distict peaks attributed to four-, ﬁve-, and six- coordinate aluminum in high magnetic ﬁelds.
Flip angle: 15deg