T.S. Antonenko, IDENTIFICATION OF MAGHEMIT IN SYNTHESIZED AND NATURAL IRON OXIDES USING THERMOMAGNETIC ANALYSIS AND FERROMAGNETIC RESONANCE DATA
https://doi.org/10.15407/mineraljournal.48.02.042
UDC 549.731.1(3 + 8) : 537.622
IDENTIFICATION OF MAGHEMIT IN SYNTHESIZED AND NATURAL IRON OXIDES
USING THERMOMAGNETIC ANALYSIS AND FERROMAGNETIC RESONANCE DATA
T.S. Antonenko 1, PhD (Geology, Mineralogy), Research Fellow
E-mail: tetyana_savchenko@ukr.net; orcid: 0000-0002-0583-3541
O.A. Kalinichenko 1, PhD (Physics, Mathematics), Senior Research Fellow
E-mail: okalinichenko@nas.gov.ua; ResearcherID: AAP-5127-2020
M.M. Bagmut 1, PhD (Geology, Mineralogy), Leading Researcher
E-mail: nnbagmut@gmail.com; orcid: 0000-0002-4309-4970
A.M. Kalinichenko 1, PhD (Geology, Mineralogy), Leading Researcher
E-mail: akalinichenko@gmail.com; orcid: 0000-0001-7597-4617
A.M. Kudelya 2, PhD (Physics, Mathematics)
E-mail: kudelya2015@ukr.net; orcid: 0000-0002-6166-3479
1 M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
2 State Enterprise "V.S. Balytskyi Research Institute of Construction Production"
51, Lobanovsky Ave., Kyiv, Ukraine, 03119
Language: Ukrainian
Mineralogical journal 2026, 48 (2): 42-56
Abstract: Thermomagnetic analysis (TMA) and ferromagnetic resonance (FMR) methods were employed to investigate synthetic samples of synthetic magnetite and maghemite samples prepared from various precursors (lepidocrocite-starch mixtures, from magnetic film and synthetic hematite), as well as natural iron ores before and after grinding in different media. The results obtained for synthetic standards confirm that maghemite is a thermally unstable compound with an inversion temperature to hematite near 400 °C, which does not allow determining the Curie temperature (TС). It was established that higher inversion temperatures and TС values exceeding the Curie point of magnetite indicate the formation of cation-deficient (maghemitized) magnetite phases with varying oxidation degrees or doped maghemite. The study demonstrates the capability of these methods to identify maghemite in ferruginous quartzites after short-term dry and wet grinding (ranging from neutral to acidic media). A sharp decrease in magnetization near 400 °C is attributed to maghemite inversion, while the effect at 350 °C is associated with the surface oxidation of magnetite. These finding can be applied to evaluate ore quality and optimize mineral processing.
Keywords: magnetite, maghemite, iron ore, thermomagnetic analysis, ferromagnetic resonance, dry and wet grinding.
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