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نشریه دانشکده فنی
Article 9, Volume 38, Issue 4 - Serial Number 404, October 2004 PDF (439.36 K)
Abstract
Nano-crystalline particles of baruim hexaferrite (BaFe2O19) have been prepared by a sol-gel combustion technique using nitrate- citrate gels. Ammonia and sodium hydroxide were used as adjusting agents. The results revealed that the nitrate-citrate gels in both cases exhibit a self-propagating behavior after ignition. The thermal decomposition process of the nitrate citrate gels and as-burnt powders was investigated by XRD and DTAITG techniques. The results indicated that the single phase of Ba-hexaferrite forms at a relatively low temperature of 900°C when ammonia is used as a pH adjusting agent. Also, the SEM investigations and VSM measurements revealed that the barium hexaferrite particles processed in the presence of ammonia exhibit a larger mean particle size and higher magnetic properties in comparison with those of processed using sodium hydroxide.

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