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Paper Information

Journal:   JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)   November 2004 , Volume 38 , Number 4 (86); Page(s) 563 To 571.
 
Paper: 

INFLUENCE OF PH ADJUSTING AGENT ON THE CHARACTERISTICS OF BA-HEXAFERRITE PARTICLES PREPARED BY SOL-GEL COMBUSTION METHOD

 
 
Author(s):  ATAEI A., MALI A.
 
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Abstract: 

Nano-crystalline particles of barium hex ferrite (BaFe12O19) 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 DTA/TG techniques. The results indicated that the single phase of Ba- hex ferrite 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 hex ferrite 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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