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<p>The BiFe<sub>1-<i>x</i></sub>Co<sub><i>x</i></sub>O<sub>3</sub> solid solutions with low concentrations of the cobalt ions (0 ≤ <i>x</i> ≤ 0.15) were prepared by the solid-phase synthesis. It has been established by the <i>X</i>-ray diffraction analysis that all the ceramic samples are described by the rhombohedral phase <i>R</i>3<i>c</i>, which is characteristic of BiFeO<sub>3</sub>. Possible causes of the concentration changes in the structural parameters, which are caused by various mechanisms, are discussed. The analysis of the microstructure has shown that, at the low concentrations (up to 5 mol. %) of the cobalt ions, the synthesis occurs in the presence of the liquid phases of the eutectic origin. When doped with the cobalt ions more than 5 mol. %, a dense ceramic with coarse grains is formed, the size of which increases with an increase in the concentration of the Co ions. The permittivity ε was measured in a wide frequency range from 100 Hz to 1 MHz in the presence of an external magnetic field with an induction up to B equal to = 0.86 T. The dielectric spectroscopy has established the presence of a temperature-smeared maximum of a relaxation character on the <i>ε</i>'/<i>ε</i><sub>0</sub>(<i>T</i>) dependences, the position of which can be associated with both structural rearrangements accompanying the magnetic phase transition and a change in the dielectric properties of the components of the multiphase system, which are the BiFe<sub>1-<i>x</i></sub>Co<sub><i>x</i></sub>O<sub>3</sub> solid solutions under study.</p>

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Structure and magnetodielectric properties of the BiFe1-xCoxO3 solid solutions in the range x = 0–0.15

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • A. O. Galatova,
  • D. I. Rudsky,
  • D. V. Volkov,
  • I. A. Verbenko,
  • Yu. I. Yurasov,
  • A. V. Nazarenko,
  • Yu. V. Kabirov,
  • K. P. Andryshin,
  • I. N. Andryshina,
  • L. A. Reznichenko,
  • A. G. Rudskaya

摘要

The BiFe1-xCoxO3 solid solutions with low concentrations of the cobalt ions (0 ≤ x ≤ 0.15) were prepared by the solid-phase synthesis. It has been established by the X-ray diffraction analysis that all the ceramic samples are described by the rhombohedral phase R3c, which is characteristic of BiFeO3. Possible causes of the concentration changes in the structural parameters, which are caused by various mechanisms, are discussed. The analysis of the microstructure has shown that, at the low concentrations (up to 5 mol. %) of the cobalt ions, the synthesis occurs in the presence of the liquid phases of the eutectic origin. When doped with the cobalt ions more than 5 mol. %, a dense ceramic with coarse grains is formed, the size of which increases with an increase in the concentration of the Co ions. The permittivity ε was measured in a wide frequency range from 100 Hz to 1 MHz in the presence of an external magnetic field with an induction up to B equal to = 0.86 T. The dielectric spectroscopy has established the presence of a temperature-smeared maximum of a relaxation character on the ε'/ε0(T) dependences, the position of which can be associated with both structural rearrangements accompanying the magnetic phase transition and a change in the dielectric properties of the components of the multiphase system, which are the BiFe1-xCoxO3 solid solutions under study.