Barium ferrite (BaFe12O19) prepared by solution evaporation techniques from ethylene glycol/citric acid or ethylene glycol/pyridine-1-oxide solutions is initially obtained in a glassy form. Although visual observations on samples heated to 1250° C showed that transparency was maintained in thin sections, X-ray powder diffraction studies showed the development of ordered regions of BaFe12O19. Prolonged heating at 1250° C resulted in a loss of visual transparency. Samples of partially amorphous material cooled rapidly in a weak magnetic field were found to have a magnetization considerably higher than samples cooled in the absence of a field. Samples rendered polycrystalline by heating for extended periods at 1250° C showed a lower magnetization on magnetic quenching.
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Gallacher, D.G., Richardson, R.T. & Willey, R.J. The effects of magnetic quenching on glassy barium ferrite. J Mater Sci 19, 1277–1282 (1984). https://doi.org/10.1007/BF01120039
- Magnetic Field
- Thin Section
- Powder Diffraction