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Abstract <p>Ba<sub>0.5</sub>Sr<sub>0.5</sub>Fe<sub>12 – <i>x</i></sub>Cr<sub><i>x</i></sub>O<sub>19</sub> (<i>x</i> = 0.5–3) hexaferrites are synthesized by a solid-phase reaction method. The influence of substitution of chromium ions (Cr<sup>3+</sup>) for iron ions (Fe<sup>3+</sup>) on the structure and morphology of the materials is studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). All synthesized samples are found to be single-phase and to have a magnetoplumbite structure. When the chromium content increases, the unit cell parameters (<i>a</i>, <i>c</i>, <i>V</i>) decrease monotonically, which is explained by the smaller ionic radius of Cr<sup>3+</sup> compared to Fe<sup>3+</sup>. The substitution is found to decrease the Curie temperature (<i>T</i><sub>C</sub>) due to a weakening of the superexchange interaction. The investigation of dielectric properties demonstrates that chromium doping improves dielectric characteristics: the permittivity increases in the low-frequency region and the dielectric losses decrease significantly.</p>

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Effect of Chromium Doping on the Structure and Properties of Ba0.5Sr0.5Fe12 – xCrxO19 Hexaferrites

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • D. P. Sherstyuk,
  • A. R. Zykova,
  • A. I. Kovalev,
  • V. E. Zhivulin,
  • D. A. Vinnik

摘要

Abstract

Ba0.5Sr0.5Fe12 – xCrxO19 (x = 0.5–3) hexaferrites are synthesized by a solid-phase reaction method. The influence of substitution of chromium ions (Cr3+) for iron ions (Fe3+) on the structure and morphology of the materials is studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). All synthesized samples are found to be single-phase and to have a magnetoplumbite structure. When the chromium content increases, the unit cell parameters (a, c, V) decrease monotonically, which is explained by the smaller ionic radius of Cr3+ compared to Fe3+. The substitution is found to decrease the Curie temperature (TC) due to a weakening of the superexchange interaction. The investigation of dielectric properties demonstrates that chromium doping improves dielectric characteristics: the permittivity increases in the low-frequency region and the dielectric losses decrease significantly.