Structural and Magnetic Properties of New Type Ca_xSr_1-x-yLa_yO•nFe_(2n-z)/nCo_z/nO₃ Magnets

Abstract:

Considering that Ca²⁺ has the similar ion radius and the substituted ability as Sr²⁺ and Ba²⁺ but the same family, Ca_xSr_1-x-yLa_yO•nFe_(2n-z)/nCo_z/nO₃ ferrites have been synthesized by the conventional ceramic process. Structure and magnetic properties of Ca_xSr_1-x-yLa_yO•nFe_(2n-z)/nCo_z/nO₃ compounds have systematically been investigated by X-ray diffraction (XRD), vibrating sample magnetometer (VSM), scanning electron microscope (SEM) and B-H hysteresis curve measurements. Several compositions are selected to investigate the formation of M phase with the joint replacement of Ca-La-Co. It is found that the formation mechanism is based on the replacement of Sr²⁺ by La³⁺ plus Ca²⁺ and the charge compensation by Co²⁺. In futher results, the unexpectedly intrinsic coercivity of 436 kA/m and residual flux density of 0.445 T were obtained. In terms of material preparation, we believe that Ca_xSr_1-x-yLa_yO•nFe_(2n-z)/nCo_z/nO₃ is effective in the production of future high energy permanent magnets.

• Periodical: Advanced Materials Research (Volume 1058)
• Pages: 107-112
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1058.107
• Online since: November 2014
• Authors: Xian Song Liu, Ji Liang Yang, Hui Yang
• Keywords: Ca²⁺ Substitution, Magnetic Property, Magnetoplumbite

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