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27Al MAS NMR spectra of Al-doped ferrihydrite samples: (a) Fh10, (b) Fh30, (c) Fh50, (d) Fh70, and (e) Fh90. The spectra were obtained with the carrier frequency on-resonance with the diamagnetic components. Isotropic resonances are labeled. Right side: expansion of the diamagnetic region.
