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Influences of preheat treatment on the anisotropy and particle size of BaTiCoFe10O19 powders

H. Y. HE1,* , J. F. HUANG1, L. Y. CAO1, J. P. WU1, Q. SHEN1

Affiliation

  1. School of Material Science & Engineering, Shaanxi University of Science & Technology, China

Abstract

Ultrafine substituted M-type barium ferrite BaTiCoFe10O19 powders were synthesized successfully by sol-gel method. The hydroxide precursor particles were formed in gel solution containing ethanol and water at a ratio of 1:1 and NaOH as co-precipitation agent. The effects of preheat treatments on formation and anisotropy of BaTiCoFe10O19 powders were studied using XRD and SEM. The XRD analysis indicated single phase BaTiCoFe10O19 powders were formed. The average particle sizes of the powders were about 40nm. Calculation of c/a value with XRD data indicated that the Ti-Co-substitution and preheat treat changed drastically atomic lattice anisotropy of hexaferrite powders. The average c/a ratio increased from 3.9347 for BaFe12O19 powders to 3.9415 for no preheat treat and 3.9392 and 3.9432 for preheat treat for 1h at 300oC and 400oC respectively. SEM analyses revealed that the particles had platelike morphology and the aspect ratio in morphology of the powders non-preheated and preheated at 400oC were larger than that of powders preheated at 300oC..

Keywords

Sol-gel method, Preheat treatment, BaTiCoFe10O19, powder, Magnetic anisotropy, c/a ratio.

Submitted at: March 22, 2007
Accepted at: July 15, 2007

Citation

H. Y. HE, J. F. HUANG, L. Y. CAO, J. P. WU, Q. SHEN, Influences of preheat treatment on the anisotropy and particle size of BaTiCoFe10O19 powders, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 7, pp. 2275-2278 (2007)