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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Witkowski, A.
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Publications (4/4 displayed)
- 2016Multiphase Biomineralization: Enigmatic Invasive Siliceous Diatoms Produce Crystalline Calcitecitations
- 2015The thermo-oxidative degradation of poly(4-methylstyrene) and its relationship to flammabilitycitations
- 2008Effect of milling medium on the structure and magnetic properties of mechanically alloyed barium ferrite
- 2008Influence of chemical composition on phase constitution and magnetic properties of magnets processed by devitrification of BaO-Fe<inf>2</inf>O<inf>3</inf>-B<inf>2</inf>O<inf>3</inf>glasses
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article
Influence of chemical composition on phase constitution and magnetic properties of magnets processed by devitrification of BaO-Fe<inf>2</inf>O<inf>3</inf>-B<inf>2</inf>O<inf>3</inf>glasses
Abstract
<p>An interesting method of the processing of hard ferrites comprises amorphisation of the starting material by rapid solidification followed by subsequent devitrification of the glassy precursor. The B<sub>2</sub>O<sub>3</sub> was used as a vitrification agent. Chemical composition of the alloys from the BaO-Fe<sub>2</sub> O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub> system has a decisive effect on the phase constitution and magnetic properties of the final product. In this study, the influence of the amount of the BaO in the XBaO6Fe<sub>2</sub> O<sub>3</sub>B<sub>2</sub>O<sub>3</sub> (X=1-5) system on the phase constitution and properties of the magnets was studied. After rapid solidification the material comprised both amorphous and crystalline phases. Up to BaO content X=2 precipitation of Fe<sub>3</sub>O<sub>4</sub> was observed; for the higher contents phases containing Ba appeared. After devitrification at 950 °C for 1h, for BaO content X=3, only the phase close to the hexagonal barium ferrite Ba<sub>0.91</sub> Fe<sub>11.68</sub> O<sub>18.2</sub> was obtained. For lower and higher BaO concentrations, Fe<sub>2</sub>O<sub>3</sub> and spinel BaFe<sub>2</sub>O<sub>4</sub>, respectively were observed. The best coercivity was obtained for the 2BaO6Fe<sub>2</sub> O<sub>3</sub>B<sub>2</sub>O<sub>3</sub>, whereas the remanence attained maximum for the BaO in the range from X=2 to X=3. © 2008 Advanced Study Center Co. Ltd.</p>