Effects of mechanical grinding on magneto-structural properties of BaFe12O19 powders
作者： V.A. Barinov , V.A. Tsurin , V.S. Gaviko , A.Ye. Yermakov , Ye.I. Teytel
DOI: 10.1016/0304-8853(95)90039-X
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摘要: Abstract The structural and magnetic properties of deformed powders M-type Baferrite, obtained by mechanical grinding, have been investigated using X-ray diffraction, Mossbauer spectroscopy, thermomagnetic analysis, measurements. rapid decrease in the magnetization after short grinding times air is attributed to formation a phase which paramagnetic at room temperature but 150 K behaves like spin-glass, with antiferromagnetic short-range order. From spectra this has least five non-equivalent sites iron hyperfine interaction field values Hrf(77 K): H1=38.69; H2=37.01; H3=36.14; H4= 34.31 H5=30.96 MA/m, moment μFe = 2.1μB. At longer BaFe12O19 samples were found be thermodynamically unstable decomposed partially into α-Fe2O3 Fe3O4.
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