Abstract
The magnetic structures of stoichiometric, KFe 11O 17, and non-stoichiometric, K 1.33Fe 11O 17, K + β-ferrite, have been studied with neutron powder diffraction at 10, 295 and 923 K. Parameters describing the crystal and magnetic structures were refined with the Rietveld method in the space group P6 3/mmc. In both cases the magnetic structure is antiferromagnetic below 713 K with four different magnetic Fe atoms. In the non-stoichiometric compound a larger disorder in the magnetic structure is seen at 295 K than for the stoichiometric. This disorder could be attributed to the Fe1 atoms in 18h-sites ( x, 2 x, z) and be seen as a function of the charge compensation of the excess of K + ions in the non-stoichiometric sample.
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