Tm. Clark et Bj. Evans, ENHANCED MAGNETIZATION AND CATION DISTRIBUTIONS IN NANOCRYSTALLINE ZNFE2O4 - A CONVERSION ELECTRON MOSSBAUER SPECTROSCOPIC INVESTIGATION, IEEE transactions on magnetics, 33(5), 1997, pp. 3745-3747
The synthesis of nanocrystalline zinc ferrite (ZnFe2O4) has been accom
plished by a variety of chemical and mechanochemical techniques. An en
hanced magnetization, 4-5 times that of bulk zinc ferrite, is observed
for the nanoparticles regardless of synthesis method. The hypothesis
that the enhanced magnetization is due to partially inverted nanocryst
alline zinc ferrite has been examined by transmission Fe-57 Mossbauer
spectroscopy (TMS), conversion x-ray Mossbauer spectroscopy (CXMS) and
conversion electron Mossbauer spectroscopy (GEMS). Both TMS and CXMS
data indicate differences in local structure between bulk and nanocrys
talline samples, however they do not suggest that the samples are part
ially inverted, GEMS data are similar for both bulk and nanocrystallin
e samples, indicating similar cation distributions near the surface of
nanocrystalline and bulk particles.