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Magnetic properties and composition range of non-stoichiometric m-type hexagonal ferrites prepared by ion exchange |
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| Authors: | O. Kalogirou D. Samaras A. C. Stergiou |
| Affiliation: | 3rd Laboratory of Physics, Department of Physics, Aristotelian University, 54006, Thessaloniki, Greece Department of Electrical Engineering, Aristotelian University, 54006, Thessaloniki, Greece Laboratory of Applied Physics, Department of Physics, Aristotelian University, 54006, Thessaloniki, Greece |
| Abstract: | Single crystals of Ba, Sr M-type hexagonal ferrites were prepared by ion exchange in Ba, Sr containing molten salts from single crystals of β″ -ferrites. A fast diffusion of the divalent Ba2+, Sr2+ is observed leading to a non-stoichiometric M-type ferrite with chemical formula: Ba1+xFe10.5Co0.25O17+x (0 ≤ x ≤ 0.25). x depending on the exchange reaction time. Saturation magnetization ranges from 19 to 64 emu/g depending on exchange conditions. The Curie temperature is (470 ± 5)°C. An easy axis direction (Ms c) has been determined in all cases. The observed anisotropy is considerably lower than that of M ferrite. The calculated anisotropy constants are, in 106 erg/cm3, K1 = 0.8 and K2 = 1.0 at room temperature. |
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