Structural and magnetic properties of hydrothermally synthesized Ca-doped hematite
Mironovich A.Y. Skorlupin G.A. Kostishin V.G. Ril A.I. Shakirzyanov R.I. Savchenko E.S.
July 2025Elsevier B.V.
Next Materials
2025#8
Powders of calcium-substituted hematite were synthesized via hydrothermal method. The samples were characterized using X-ray diffraction, Mössbauer spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, and magnetometry. Structural analysis revealed that Ca-substituted samples maintained single-phase hematite for Fe/Ca ratios between 11 and 5. Further increase in calcium concentration led to formation of a defective iron-calcium spinel phase. Infrared spectra confirmed the presence of hydroxyl groups within the hematite lattice. The incorporation of calcium and associated defects significantly influenced the magnetic properties of hematite, inducing ferromagnetic behavior. The maximum magnetization value of 12.9 emu/g was achieved at Fe/Ca = 6, representing a substantial enhancement compared to most other doped hematites. These materials show potential for applications in hyperthermia, MRI contrast enhancement, and wastewater treatment.
Hematite , Magnetic Materials , Magnetic Properties , Mössbauer Spectroscopy , X-Ray Diffraction
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National University of Science and Technology MISIS, Leninsky Prospect, 4, Moscow, 119049, Russian Federation
Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences (IGIC RAS), Leninsky Prospekt, 31, Moscow, 119991, Russian Federation
Engineering Profile Laboratory, L.N. Gumilyov Eurasian National University, Nur-Sultan, 010008, Kazakhstan
National University of Science and Technology MISIS
Kurnakov Institute of General and Inorganic Chemistry
Engineering Profile Laboratory
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