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Abstract <p>Samples of cobalt ferrite CoFe<sub>2</sub>O<sub>4</sub> are synthesized by coprecipitation: 1)&#xa0;from iron(III) and cobalt(II) nitrates followed by calcination of the obtained precipitate at 500&#xa0;°C and 1000&#xa0;°C; 2)&#xa0;from iron(III) nitrate and cobalt(II) chloride followed by calcination of the obtained precipitate at 500&#xa0;°C. They are characterized by powder X-ray diffraction, scanning electron microscopy, X-ray energy dispersive and Mössbauer spectroscopy, and <i>in situ</i> magnetometry. Before calcination the samples exhibit superparamagnetism; and the phase formation is not completed. The calcination stage is needed to reach the crystalline state. The crystalline sample with unit cell parameter <i>a</i>&#xa0;=&#xa0;8.386&#xa0;Å forms after calcination at 1000&#xa0;°C. Magnetometric measurements show the formation of a phase with the Curie temperature close to 500&#xa0;°C. According to the Mössbauer spectroscopic data, the cation distribution in the sample can be described as Fe<sub>0.53</sub>Co<sub>0.47</sub> [Fe<sub>1.47</sub>Co<sub>0.53</sub>]O<sub>4</sub>. At –196&#xa0;°C and 23&#xa0;°C the calculated sizes of magnetic domains are 3.0&#xa0;nm and 2.5&#xa0;nm respectively.</p>

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Structure and Properties of Cobalt Ferrite Synthesized by Coprecipitation

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • T. V. Bogdan,
  • N. V. Mashchenko,
  • D. A. Pankratov,
  • P. A. Chernavskii,
  • V. A. Abarina,
  • A. E. Koklin,
  • P. S. Lukyanov,
  • I. I. Mishanin,
  • V. I. Bogdan

摘要

Abstract

Samples of cobalt ferrite CoFe2O4 are synthesized by coprecipitation: 1) from iron(III) and cobalt(II) nitrates followed by calcination of the obtained precipitate at 500 °C and 1000 °C; 2) from iron(III) nitrate and cobalt(II) chloride followed by calcination of the obtained precipitate at 500 °C. They are characterized by powder X-ray diffraction, scanning electron microscopy, X-ray energy dispersive and Mössbauer spectroscopy, and in situ magnetometry. Before calcination the samples exhibit superparamagnetism; and the phase formation is not completed. The calcination stage is needed to reach the crystalline state. The crystalline sample with unit cell parameter a = 8.386 Å forms after calcination at 1000 °C. Magnetometric measurements show the formation of a phase with the Curie temperature close to 500 °C. According to the Mössbauer spectroscopic data, the cation distribution in the sample can be described as Fe0.53Co0.47 [Fe1.47Co0.53]O4. At –196 °C and 23 °C the calculated sizes of magnetic domains are 3.0 nm and 2.5 nm respectively.