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Mössbauer spectra of 8 nm hematite nanoparticles ground in a mortar with η-Al2O3 nanoparticles for the indicated periods of time. (a) Spectra obtained at room temperature. (b) Spectra obtained at 80 K. Reprinted with permission from Xu, M.; Bahl, C. R. H.; Frandsen, C.; Mørup, S. Inter-particle interactions in agglomerates of α-Fe2O3 nanoparticles: Influence of grinding, J. Colloid Interface Science 2004, 279 132–136. Copyright (2004) by Elsevier.
