Abstract
Mossbauer studies are made of 57Fe nuclei in dry SiO2·xFe2O3 gels at low temperatures in external magnetic fields. It is shown that the state of the iron atoms in the gels depends significantly on their concentration. In dry gels with an iron content exceeding 0.01Fe2O3, the Fe atoms belong to finely dispersed particles of the oxide with maximum sizes of ∼80 A in a superparamagnetic state. For lower iron contents, the Fe atoms are in the form of a highly diluted paramagnetic impurity of trivalent ions in a diamagnetic matrix. It is assumed that clusters develop from a small number of iron and oxygen ions dispersed in the gel matrix. Here spin-lattice relaxation of the magnetic moments of the iron atoms is observed.
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