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<p>In this work, ceramics with the formula Bi<sub>(1-x)</sub>RE<sub>x</sub>FeO<sub>3</sub> (RE = Pr<sup>3+</sup>, Dy<sup>3+</sup>, Eu<sup>3+</sup>) (0 ≤ <i>x</i> ≤ 0.15) were prepared by the Pechini method. The influence of the diverse cations on the BiFeO<sub>3</sub> crystal structure, grain size, as well as electrical and magnetic properties was investigated. XRD results revealed the BiFeO<sub>3</sub> phase in all the compounds. The Rietveld refinement analysis confirmed the rhombohedral structure (R3c space group) and the successful formation of solid solutions in the specimens with Pr<sup>3+</sup> (<i>x</i> = 0.05–0.10), Dy<sup>3+</sup> (<i>x</i> = 0.05) and Eu<sup>3+</sup> (<i>x</i> = 0.10) content. In the same way, the slight variations in the cell parameters detected in Rietveld analysis, as well as density values measurements confirmed the partial substitution of Bi<sup>3+</sup> by the diverse cations into the A-site of the BiFeO<sub>3</sub> crystalline structure. Scanning Electron Microscopy showed sizes &lt; 150&#xa0;nm with globular morphologies, as well as the successful grain densification with low intergranular porosity obtained in the ceramics using conventional sintering process. The electrical response of the specimens was evaluated by Electric Impedance Spectroscopy (EIS) measurements in the frequency range of 1&#xa0;kHz–1&#xa0;MHz at different temperatures (25–300&#xa0;°C). The specimens with Pr<sup>3+</sup> (<i>x</i> = 0.05–0.10) showed higher permittivity values at the diverse frequencies in comparison with the specimens with Dy<sup>3+</sup> and Eu<sup>3+</sup>. The magnetic response of the ceramics exhibited modifications in the hysteresis curves and coercive fields in comparison with the BiFeO<sub>3</sub> compound. Finally, the results of this study provided interesting data attributed to the single-phase BiFeO<sub>3</sub> compounds and they may find potential device applications.</p>

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Influence of partial bismuth substitution at A-site in Bi(1-x)RExFeO3 (RE = Pr3+, Dy3+, Eu3+) in crystal structure: effect on electrical and magnetic properties

  • 期刊论文

  • 发表日期：

    2025年4月4日

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  • D. S. García-Zaleta,
  • A. M. Torres-Huerta,
  • M. A. Domínguez-Crespo,
  • A. Reyes-Montero,
  • C. G. Díaz-Hernández

摘要

In this work, ceramics with the formula Bi(1-x)RExFeO3 (RE = Pr3+, Dy3+, Eu3+) (0 ≤ x ≤ 0.15) were prepared by the Pechini method. The influence of the diverse cations on the BiFeO3 crystal structure, grain size, as well as electrical and magnetic properties was investigated. XRD results revealed the BiFeO3 phase in all the compounds. The Rietveld refinement analysis confirmed the rhombohedral structure (R3c space group) and the successful formation of solid solutions in the specimens with Pr3+ (x = 0.05–0.10), Dy3+ (x = 0.05) and Eu3+ (x = 0.10) content. In the same way, the slight variations in the cell parameters detected in Rietveld analysis, as well as density values measurements confirmed the partial substitution of Bi3+ by the diverse cations into the A-site of the BiFeO3 crystalline structure. Scanning Electron Microscopy showed sizes < 150 nm with globular morphologies, as well as the successful grain densification with low intergranular porosity obtained in the ceramics using conventional sintering process. The electrical response of the specimens was evaluated by Electric Impedance Spectroscopy (EIS) measurements in the frequency range of 1 kHz–1 MHz at different temperatures (25–300 °C). The specimens with Pr3+ (x = 0.05–0.10) showed higher permittivity values at the diverse frequencies in comparison with the specimens with Dy3+ and Eu3+. The magnetic response of the ceramics exhibited modifications in the hysteresis curves and coercive fields in comparison with the BiFeO3 compound. Finally, the results of this study provided interesting data attributed to the single-phase BiFeO3 compounds and they may find potential device applications.