Kr. Kuhlman et al., Fabrication of specimens of metamorphic magnetite crystals for field ion microscopy and atom probe microanalysis, ULTRAMICROS, 89(1-3), 2001, pp. 169-176
Field ion specimens have been successfully fabricated from samples of metam
orphic magnetite crystals (Fe3O4) extracted from a polymetamorphosed, granu
lite-facies marble with the use of a focused ion beam. These magnetite crys
tals contain nanometer-scale, disk-shaped inclusions making this magnetite
particularly attractive for investigating the capabilities of atom probe fi
eld ion microscopy (APFIM) for geological materials. Field ion microscope i
mages of these magnetite crystals were obtained in which the observed size
and morphology of the precipitates agree with previous results. Samples wer
e analyzed in the energy compensated optical position-sensitive atom probe.
Mass spectra were obtained in which peaks for singly ionized O-16, Fe-56 a
nd (FeO)-Fe-56 and doubly ionized Fe-54, Fe-56 and Fe-57 peaks were fully r
esolved. Manganese and aluminum were observed in a limited analysis of a pr
ecipitate in an energy compensated position sensitive atom probe. (C) 2001
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