Phase Transformations and Magnetic Properties of Non-Stoichiometric Strontium Ferromolybdate
نویسندگان
1 SSPA “Scientific-Practical Materials Research Centre of the NAS of Belarus”, 220072 Minsk, Belarus
2 SSPA “Scientific-Practical Materials Research Centre of the NAS of Belarus”, 220072 Minsk, Belarus
3 Institute of Physics and Technology, Mongolian Academy of Sciences, 13330 Ulaanbaatar, Mongolia
4 Belarusian State University of Informatics and Radioelectronics, 220013 Minsk, Belarus
5 Joint Institute for Nuclear Research, 141980 Dubna, Russia
6 Dubna State University, Dubna 141980, Russia
7 Korkyt Ata Kyzylorda University, 120000, Kyzylorda, Kazakhstan
8 Korkyt Ata Kyzylorda University, 120000, Kyzylorda, Kazakhstan
9 National University of Science and Technology “MISIS”, 119049 Moscow, Russia
10 State Center “Belmicroanalysis” of the Affiliate & Design Center “Belmicrosystems” of JSC “INTEGRAL”, 220108 Minsk, Belarus
11 Natural Sciences Division, National University of Mongolia, 14201 Ulaanbaatar, Mongolia
12 Korkyt Ata Kyzylorda University, 120000, Kyzylorda, Kazakhstan
doi
10.48309/chemm.2026.563461.2053چکیده
This study investigates the phase transformation dynamics during the synthesis of non-stoichiometric strontium ferromolybdate (Sr₂Fe₁.₂Mo₀.₈O₆₋δ, SFMO) via solid-state reaction from SrCO₃, Fe₂O₃, and MoO₃. Intermediate phases SrFeO₃ and SrMoO₄ form sequentially between 500–850 K and hinder complete SFMO crystallization due to kinetic limitations at high temperatures (≥1270 K). To overcome this, combined synthesis modes involving controlled heating rates and intermediate grinding were developed, enabling the production of single-phase SFMO with 89% Fe/Mo superstructural ordering. Magnetic characterization revealed that reduced cation ordering increases antiferromagnetic clustering, suppressing long-range ferrimagnetic order and lowering magnetization in field-cooling measurements. Zero-field-cooling data confirmed superparamagnetic behavior, indicating magnetic inhomogeneity with coexisting superparamagnetic nanoparticles and ferrimagnetic grains. The results demonstrate that precise control of synthesis conditions is essential to minimize kinetic barriers, suppress defect formation, and achieve reproducible magnetic properties in SFMO, a promising candidate for spintronic applications.
