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The present work reports on the preparation of glass-crystalline samples in the compositional series 16Na2O/10CaO/(74-x)SiO2/xFe2O3, x = 20, 25 and 30 mol% via the traditional melt-quenching technique and their characterization. The phase composition was investigated by X-ray diffraction (XRD) and Electron Back-Scatter Diffraction (EBSD), which showed the presence of magnetite and some hematite. Microcomputed tomography confirmed the presence of platelet-like large crystals consisting, according to phase composition analyses, of both magnetite and hematite. Low-temperature electrical measurements revealed the occurrence of the Verwey transition of magnetite in the temperature range of 118–125 K, depending on the mean size of the magnetite crystals.

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Synthesis of Magnetite-Containing Materials for Sensor Applications: Phase Composition and Microstructural Characterization

  • 会议论文

  • 发表日期：

    2025年

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  • R. Harizanova,
  • W. Wisniewski,
  • I. Mihailova,
  • D. Tatchev,
  • G. Avdeev,
  • L. C. Costa,
  • S. Soreto Teixeira,
  • P. Švančárek,
  • C. Rüssel

摘要

The present work reports on the preparation of glass-crystalline samples in the compositional series 16Na2O/10CaO/(74-x)SiO2/xFe2O3, x = 20, 25 and 30 mol% via the traditional melt-quenching technique and their characterization. The phase composition was investigated by X-ray diffraction (XRD) and Electron Back-Scatter Diffraction (EBSD), which showed the presence of magnetite and some hematite. Microcomputed tomography confirmed the presence of platelet-like large crystals consisting, according to phase composition analyses, of both magnetite and hematite. Low-temperature electrical measurements revealed the occurrence of the Verwey transition of magnetite in the temperature range of 118–125 K, depending on the mean size of the magnetite crystals.