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Variable temperature 23Na MAS ssNMR: (a) Hahn-echo and (b) pj-MATPASS spectra of the desodiated P′3 phase, acquired from 122 K to 290 K with 20 kHz MAS. Measured at 400 MHz (9.4 T) field strength. The offset frequency was moved with temperature to optimize the signal intensity of the higher frequency resonance; the ∼0 ppm diamagnetic peak was consequently no longer observed at low temperatures at the offset frequencies shown in these spectra.
