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Effect of Precursors on the Stoichiometry and Morphology of Cobalt Ferrites

A. F. TuraevBukhara State University, 200100, Bukhara, UzbekistanO. S. KakhkhorovBukhara State University, 200100, Bukhara, UzbekistanM. Z. SharipovBukhara State University, 200100, Bukhara, UzbekistanN.M. NazarovaBukhara State University, 200100, Bukhara, UzbekistanO. E. AbdurakhmonovTashkent Institute of Chemical Technology, 100011, Tashkent, UzbekistanZ. MatkarimovTashkent Institute of Chemical Technology, 100011, Tashkent, UzbekistanSh. AbdurakhmonovTashkent Institute of Chemical Technology, 100011, Tashkent, UzbekistanM. K. KurbanovUrgench State University, 220100, Urgench, UzbekistanD. S. SaidovUrgench Technological University of Ranch, 220100, Urgench, UzbekistanM. S. PaizullakhanovInstitute of Materials Science, Academy of Sciences of Uzbekistan, 100084, Tashkent, UzbekistanS. (Sardor) AbduraimovInstitute of Materials Science, Academy of Sciences of Uzbekistan, 100084, Tashkent, UzbekistanM. PirimmatovPhysical-Technical Institute, Academy of Sciences of Uzbekistan, 100084, Tashkent, UzbekistanB. E. EgamberdievPhysical-Technical Institute, Academy of Sciences of Uzbekistan, 100084, Tashkent, UzbekistanU. B. SharopovPhysical-Technical Institute, Academy of Sciences of Uzbekistan, 100084, Tashkent, Uzbekistan

2026en

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ABI

Annotatsiya

Abstract The influence of precursors and the nominal CoO:Fe2O3 ratio on the stoichiometry and morphology of cobalt ferrites was investigated. The alloys were produced by directed solar melting at the focus of the Big Solar Furnace followed by water quenching. The microstructure was studied using transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM), while the local composition was analyzed by energy-dispersive X-ray spectroscopy (EDS). It was shown that variation of the Co/Fe ratio determines the particle size, degree of agglomeration, and structural ordering. For compositions close to CoFe2O4, more homogeneous structures are formed with a higher degree of crystallinity. Control of the melting/quenching regime stabilizes the particle size distribution. The established “precursors–composition–morphology” relationships confirm the reproducibility of solar synthesis and enable targeted selection of the initial CoO and Fe2O3 ratios and molar fractions to align the local stoichiometry with the desired nominal composition.

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DOI: 10.1134/s1063774525601637

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