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Abstract <p>Powdered materials based on bentonite and a mixed solid solution magnetite/maghemite were synthesized by the chemical coprecipitation method. Scanning electron microscopy, X-ray phase analysis, magnetic measurements, and nuclear γ-resonance spectroscopy were used to characterize the surface and study the physicochemical properties of the resulting compounds. It has been found that bentonite affects the point defects in the magnetite/maghemite crystal lattice, as well as the crystallite size and dislocation density. It has been shown that samples of the bentonite/iron oxide composite are characterized by lower residual magnetization and higher values of the effective anisotropy field strength compared to those detected for Fe<sub>3</sub>O<sub>4</sub>/γ-Fe<sub>2</sub>O<sub>3</sub> powder. Based on the Mössbauer spectroscopy data, a conclusion has been made about the localization of Fe<sup>2+</sup> ions in the bentonite structure near oxygen vacancies that form octahedral positions.</p>

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Modification of Bentonite Properties with Iron Oxide Nanoparticles

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • A. V. Noskov,
  • O. V. Alekseeva,
  • D. N. Yashkova,
  • A. V. Agafonov,
  • M. N. Shipko,
  • M. A. Stepovich,
  • E. S. Savchenko

摘要

Abstract

Powdered materials based on bentonite and a mixed solid solution magnetite/maghemite were synthesized by the chemical coprecipitation method. Scanning electron microscopy, X-ray phase analysis, magnetic measurements, and nuclear γ-resonance spectroscopy were used to characterize the surface and study the physicochemical properties of the resulting compounds. It has been found that bentonite affects the point defects in the magnetite/maghemite crystal lattice, as well as the crystallite size and dislocation density. It has been shown that samples of the bentonite/iron oxide composite are characterized by lower residual magnetization and higher values of the effective anisotropy field strength compared to those detected for Fe3O4/γ-Fe2O3 powder. Based on the Mössbauer spectroscopy data, a conclusion has been made about the localization of Fe2+ ions in the bentonite structure near oxygen vacancies that form octahedral positions.