Synthesis, Structure and Magnetic Properties of Carbon Composites Based on Finely Dispersed Powders of Different Valence Iron Oxides

Abstract:

A method for the synthesizing of carbon composites based on hydrolysis lignin powders and iron oxides (FeO and Fe₂O₃) was proposed in this work. The obtained composites were studied by X-ray diffractometry, adsorption/desorption gas porometry and magnetometry. X-ray phase analysis has revealed the presence of an amorphous carbon phase and crystalline phases of FeO, Fe₃O₄, Fe₂O₃, and Fe in both types of synthesised composites. The synthesized composites demonstrated significantly higher specific magnetisation values compared to the initial iron oxide powders. For Fe₂O₃ powder, the specific magnetisation was σ_s = 6 A·m²/kg, while the saturation specific magnetisation of the composite based on this oxide was σ_s = 34 A·m²/kg. For FeO powder, the specific magnetisation was σ_s = 28 A·m²/kg, with the composite based on it exhibiting a specific saturation magnetisation of σ_s = 40 A·m²/kg. The observed results were explained by the formation of particles with sufficiently high values of specific magnetisation due to thermal reduction of iron oxides in the presence of carbon monoxide, obtained from the pyrolysis of hydrolysed lignin.

• Periodical: Advances in Science and Technology (Volume 162)
• Pages: 3-11
• DOI: https://doi.org/10.4028/p-09oeEK
• Online since: April 2025
• Authors: Ihor Bordun*, Myroslav Malovanyy, Nazar Nahurskyi, Anatoliy Borysiuk
• Keywords: Carbon Composite, Ferric Oxide, Porous Structure, Specific Magnetisation, X-Ray Diffraction

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