Article
Metallurgy & Metallurgical Engineering
P. V. Kharitonskii, K. G. Gareev, A. Yu. Ralin, E. S. Sergienko
Summary: The magnetic properties of Fe3O4-Fe3-xTixO4 composites synthesized by various methods were simulated using an ensemble of magnetostatically interacting particles model. The results are consistent with the hysteresis characteristics obtained previously from the model of chemically heterogeneous two-phase particles. It is demonstrated that this approach is suitable for samples mainly composed of superparamagnetic particles, where the saturation remanent magnetization is provided by the particles blocked due to magnetostatic interaction.
PHYSICS OF METALS AND METALLOGRAPHY
(2023)
Article
Multidisciplinary Sciences
Gunther Kletetschka, Radana Kavkova, Hakan Ucar
Summary: The study uncovered a new magnetic mechanism for detecting plasma during impact processes and revealed changes in magnetization in rocks exposed to shockwaves. The research sheds light on how impact processes can reduce magnetic paleointensity and suggests using magnetization reduction as a new proxy for studying impact sites.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Khalida Akhtar, Kanwal Javed, Syed Sajjad Ali Shah
Summary: Uniform fine particles of iron oxide with different morphologies were prepared through forced hydrolysis and co-precipitation techniques. The experiment showed that the reaction parameters greatly influenced the uniformity and morphology of the particles. Under optimized conditions, monodispersed magnetite precursor particles with narrow size distribution were obtained. The growth mechanism of the precipitated solids was found to be sensitive to temperature and pH, with high temperature and pH resulting in larger particles, while low temperature and pH leading to smaller particles. Magnetite nanoparticles were directly precipitated through co-precipitation and from the calcination of synthesized hematite at high temperatures. Analysis confirmed the single-phase magnetite structure through SEM, XRD, and FTIR. The response of the prepared particles to temperature and surface group composition was studied using TG/DTA and FT-IR techniques.
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
A. Yu. Ralin, P. Kharitonskii, N. A. Zolotov, K. G. Gareev, Yu. A. Anikieva
Summary: In this study, the hysteresis characteristics of the Fe3O4-Fe3-xTixO4 composites were modeled using the magnetic rectangles method. It was shown that considering the contribution of superparamagnetic particles can explain the discrepancies between the theoretical and experimental magnetic properties, and the two-phase particles contribute significantly to the remanent magnetization.
ST PETERSBURG POLYTECHNIC UNIVERSITY JOURNAL-PHYSICS AND MATHEMATICS
(2022)
Article
Materials Science, Multidisciplinary
Petr Kharitonskii, Nikita Bobrov, Kamil Gareev, Andrei Kosterov, Andrey Nikitin, Andrey Ralin, Elena Sergienko, Oleg Testov, Alexander Ustinov, Nikita Zolotov
Summary: The structural, frequency and magnetic properties of magnetite ores from the Kovdor deposit in Northwest Russia were investigated. The study revealed the presence of non-stoichiometric magnetite as a major constituent of the ore, and showed that even small concentrations of superparamagnetic grains can modify the electromagnetic response of the samples.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
E. Kuzmann, K. Nomura, S. Stichleutner, A. Nakanishi, J. Pechousek, L. Machala, Z. Homonnay, R. Vondrasek, V. A. Skuratov, L. Krupa, O. Malina, T. Ingr, S. Kubuki
Summary: Fe-57 conversion electron Mossbauer spectroscopy, SEM and magnetization measurements were used to investigate the impact of heavy ion irradiation on metallic Fe-57 thin layer deposited onto SiO2/Si. The results showed that a part of iron was converted to amorphous iron and silicon-containing iron oxide phases upon irradiation. The presence of amorphous iron and superparamagnetic properties of the iron-silicon-oxide phases were confirmed.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Geochemistry & Geophysics
Patricia Leitao, Matteo Tucci, Carolina Cruz Viggi, Henri Nouws, Anthony S. Danko, Federico Aulenta
Summary: This study applied natural magnetite and hematite for the first time to accelerate the reductive dechlorination of 1,2-dichloroethane. It was found that low concentrations of magnetite significantly increased the rate of dechlorination, while hematite did not show a noticeable stimulating effect. Higher concentrations of iron oxides actually resulted in a weaker effect.
Article
Geology
Giovanny Jimenez, Carlos Alberto Garcia
Summary: We present a study on the magnetic mineralogy of Triassic to Lower Cretaceous volcano-sedimentary and continental sedimentary sequences from the Santander Massif and Eastern Cordillera in Colombia. Samples from the Norean and Jordan formations, Giron Group, Palermo, Montebel, and Russia formations were analyzed using three experiments. Results indicate that the Triassic to Middle Jurassic units are characterized by detrital magnetite with local contributions of pyrrhotite, while the Upper Jurassic to Lower Cretaceous Giron Group is dominated by ilmenite-hematite mineralogy without detrital magnetite. Differences in detrital magnetite composition may be influenced by source area distance, climate, and flow velocity.
BOLETIN DE GEOLOGIA
(2023)
Article
Geochemistry & Geophysics
Tasin Godlove Bafon, Anthony Temidayo Bolarinwa, Cheo Emmanuel Suh, Temesgen Oljira, Bekele Ayele Bedada, Gilles Nyuyki Ngoran, Kevin Ijunghi Ateh, Boris Martial Keuko Djoumbissie, Cho Terence Ngang
Summary: The Sanaga iron ore prospect is a new discovery in the Nyong Series, consisting of magnetite-bearing pyroxene-gneisses hosted by ortho-derived gneisses. The amphibolites indicate arc-related magmas generated by partial melting of a sub-continental lithospheric mantle source. Based on the study, the Sanaga MPG is interpreted as a possible skarn-type mineralization formed by the metamorphism/metasomatism of a possible BIF protolith.
Article
Environmental Sciences
Ilona Nyiro-Kosa, Faizan Ahmad, Andras Hoffer, Mihaly Posfai
Summary: Diesel and petrol powered vehicles contribute to magnetic particles in urban air, which may pose a potential health risk.
ATMOSPHERIC ENVIRONMENT-X
(2022)
Article
Engineering, Geological
Natalya A. Shkaruba, Zhasurbek I. Nabizhanov, Alexander I. Kosolapov, Alexander K. Kirsanov, Umarjon R. Teshaev
Summary: This study evaluates the prospects of using artificial intelligence technology to break rocks with fine particles in water jets. By implementing a multilayer feed-forward neural network, this technology enables quick management of the productivity of hydraulic monitors and improves the quality of gravitational enrichment of minerals, ultimately reducing mineral loss, decreasing the cost of rock breaking, and improving useful component recovery.
BULLETIN OF THE TOMSK POLYTECHNIC UNIVERSITY-GEO ASSETS ENGINEERING
(2023)
