Peculiarities of radiation damage in ferrites with spinel structure

In ZnFe2O4 irradiated by fast neutrons a superparamagnetic state (an ensemble of ferrimagnetic regions with equally probable distribution of cations over A- and B-sites in paramagnetic matrix) is achieved. The properties of superparamagnetic state allow to make conclusions about the character of replacement cascades in ferrites with spinel structure. Some parameters of the replacement cascade are given. It is shown experimentally how the irradiation temperature influence the size of the disordered regions. (author)