Improving magnetic properties of barium hexaferrites by La or Pr substitution

La or Pr substituted barium hexaferrites, Ba1-x(La or Pr)(x)Fe12O19, x=0.00-0.20, were successfully prepared by a citrate combustion process. The sintered bodies were structurally and magnetically studied by powder X-ray diffraction (XRD) and vibrating sample magnetometry (VSM). All XRD patterns show the single phase of the magnetoplumbite barium ferrite without other intermediate phases. Magnetization (M-S) and coercive field (H-C) could be improved by substitutions of La or Pr ions on Ba ion basis sites. The M-S reveal magnetic behavior with respect to La or Pr ions content, showing an increase at first and then a decrease. The H-C increases remarkably with increasing La or Pr ions content. (c) 2006 Elsevier Ltd. All rights reserved.