Abstract
Abstract From the temperature dependences of dielectric permittivity the Curie temperatures of ferroelectric-magnetics with the potassium tungsten bronze type structure Sr6Nb9FeO30 and Ba6Nb9FeO30 were determined. It was shown that the magnetic ordering in these crystals may have antiferromagnetic character. The quadrupole splitting of the Mossbauer absorption spectrum of Sr6Nb9FeO30 also exists above the Curie temperature and is probably due to the distribution of the Nb5+ and Fe3+ ions.
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