Abstract
The dynamics of the bipyramidal 4e−Fe ions in the M-type hexagonal ferrite La0.7Na0.3Fe12O19 single crystal, is investigated by using Mossbauer spectroscopy. We show that a photon self-interference phenomenon can be used to explain the available experimental data. From this model we have deduced the jumping distance of the Fe(4e) ions. This model can also be succesfully used to investigate the existing data on the isomorphous CaAl11FeO19 and BaFe12O19 oxides. In all cases, the calculated jumping distances are in a excellent agreement with X-ray diffraction results. For CaAl11FeO19 and BaFe12O19 we have deduced the thermal dependence of the jumping distance. Any evidence of an atomic freezing is not found in the temperature range 80–300 K.
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