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19F and 1H (in the inset on the left) solid-state MAS (64 kHz and 60 kHz, respectively) NMR spectra of MgF2 samples prepared from (a) acetate, (b) carbonate, (c) chloride and (d) nitrate magnesium precursors, before the HF activation step and for 19F of (e) a micro crystalline sample of MgF2. The isotropic lines of the 19F spectra are expanded in the inset on the right. The star symbols on the 19F spectra indicate the spinning sidebands.
