ガラス中から析出させたBa1-xSrxFe12O19粒子に関する研究

概要

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Ba1-xSrxFe12O19 particles were prepared by the glass-ceramic method. Ba1-xSrxFe12O19 particles precipitated by heat-treatment of BaO-SrO-B2O3-SiO2-Fe2O3 glass in the temperature range from 600° to 900°C. The particles showed a habit as hexagonal platelet with fairly uniform dimension, which could be taken out easily of the glass matrix by leaching with a dil. HCl solution. In the case of SrO rich glass, 4SrO⋅B2O3⋅SiO2 precipitated abruptly and consequently Ba1-xSrxFe12O19 particles precipitated with a small dimension of 0.1-0.4μm. On the other hand, BaFe12O19 particles with a relatively larger dimension of 0.1-2μm were obtained from a SrO free glass. Ba1-xSrxFe12O19 particles with 0.43 pm in size, prepared under the heat-treatment condition at 875°C for 5 hr, showed coercive force of 6000 Oe except for BaFe12O19. These particles showed a characteristic I-H curve for single domain particle assemblies.
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