Chemistry Reference
In-Depth Information
Fig. 3.43
Mössbauer spectrum at RT (left) and 80 K (right) of an iron nodule in a planosol
Fig. 3.44 Quadrupole distribution (left) from the RT spectrum of the nodule and the spectrum
refitted with 2 doublets (right)
In conclusion, also the use of quadrupole-splitting distributions may reveal the
presence of minor doublet fractions in multi-phase Mössbauer spectra.
3.7.3 Magnetic Mineralogy
Many soil or rock samples contain magnetic minerals other than hematite, such as
magnetite, titanomagnetite and maghemite, which are often only present in small
amounts. These magnetic compounds appear then as vague sextets in the
Mössbauer spectra and as-such can hardly be analyzed. Magnetic separation is
then the pre-eminently solution to bring this interesting magnetic mineralogy on
the foreground. A strong hand magnet can already be used for that purpose, but a
more sophisticated magnetic separator is obviously more efficient.
