Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of Aging Coprecipitate on the Synthesis Process of Ba-Ferrite

공심물의 숙성이 Ba-Ferrite의 합성과정에 미치는 영향

  • 김태옥 (부산대학교 무기재료공학과) ;
  • 김은동 (부산대학교 무기재료공학과)
  • Published : 1983.04.01
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Abstract

The effect of aging coprecipitate obtained by the reaction of mixed solution 1.1 mol FeCl-0.1 mol $BaCl_2$ and 4.0 mol. NaOH-1.0 mol $K _2 CO_3$ on the synthesis process of Baferrite $(BaFe_{12}O_{19})$ was investigated by means of DTA, TGA, XRD and electron microscope. The no-aged coprecipitate seems to be the aggregate of amorphosus $Fe_3$ .$nH_2O$ and (1-X) $BaCO_3$.$xBa(OH)_2$, but the 30 days-aged to be composed of crystalline $Fe_2O_3H_2O$ and $BaCO_3$. The decomposition temperature of $BaCO_3$ in the coprecipitate increases from 400-$700^{\circ}C$ to 700-90$0^{\circ}C$ with increment of aging-time. In the no-aged coprecipitate Ba-ferrite is synthesized through the surface reaction of amorphous Fe_2O_3$ and skeleton crystal BaO at 800-90$0^{\circ}C$ with more compact crystalization. During calcination of the 30 days-aged coprecibitate the intermediate phase BaFe_2O_4$ is formed at 600-$700^{\circ}C$ and completely transformed to Ba-ferrite at 800-90$0^{\circ}C$.

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References

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