1. Complex magnetism of single-crystalline AlCoCrFeNi nanostructured high-entropy alloyPrimož Koželj, Andreja Jelen, Goran Dražić, Stanislav Vrtnik, Jože Luzar, Magdalena Wencka, Anton Meden, Michael Feuerbacher, Janez Dolinšek, 2023, original scientific article Abstract: We have investigated magnetism of the Al28Co20Cr11Fe15Ni26 single-crystalline high-entropy alloy. The material is nanostructured, composed of a B2 matrix with dispersed spherical-like A2 nanoparticles of average diameter 64 nm. The magnetism was studied from 2 to 400 K via direct-current magnetization, hysteresis curves, alternating-current magnetic susceptibility, and thermoremanent magnetization time decay, to determine the magnetic state that develops in this highly structurally and chemically inhomogeneous material. The results reveal that the Cr-free B2 matrix of composition Al28Co25Fe15Ni32 forms a disordered ferromagnetic (FM) state that undergoes an FM transition at 390 K. The Al- and Ni-free A2 nanoparticles of average composition Co19Cr56Fe25 adopt a core-shell structure, where the shells of about 2 nm thickness are CoFe enriched. While the shells are FM, the nanoparticle cores are asperomagnetic, classifying into the broad class of spin glasses. Asperomagnetism develops below 15 K and exhibits broken-ergodicity phenomena, typical of magnetically frustrated systems.
Keywords: complex magnetism, high-entropy alloys, nanostructured alloys
Published in DiRROS: 13.04.2026; Views: 36; Downloads: 29
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3. Impact of chelating agent choice on growth kinetics and defect chemistry in sol–gel-synthesized Li- and Mn-rich layered cathodesRabail Badar Abbasi, Marjan Bele, Giuliana Aquilanti, Jasper Rikkert Plaisier, Anton Meden, Luis Miguel Guerrero Mejía, Robert Dominko, Elena Tchernychova, 2026, original scientific article Published in DiRROS: 07.04.2026; Views: 84; Downloads: 69
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4. Structure, nanostructure and unconventional magnetic state of the light rare-earths based ▫$Ce_xPrNdSm$▫ (▫$x$▫= 0.01–1.5) medium-entropy alloysJulia Petrović, Stanislav Vrtnik, Andreja Jelen, Primož Koželj, Jože Luzar, Peter Mihor, Gregor Kapun, Goran Dražić, Anton Meden, Pascal Boulet, Janez Dolinšek, 2026, original scientific article Keywords: high-entropy alloys, light earth earths, unconventional magnetic state
Published in DiRROS: 26.02.2026; Views: 214; Downloads: 126
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5. Hydration and carbonation behaviour of selected recycled materials from SloveniaVesna Zalar Serjun, Primož Oprčkal, Anton Meden, Marta Počkaj, Romana Cerc Korošec, 2025, published scientific conference contribution Abstract: The European Union’s shift towards a circular economy emphasizes the substitution of virgin materials with recycled alternatives, particularly in the construction sector, which can accommodate large volumes of industrial by-products. Ashes from coal, biomass, paper sludge, and co-combustion processes are abundant secondary materials whose variable chemical and mineralogical compositions necessitate careful assessment to enable safe and effective reuse.This study investigates the hydration behaviour and early carbonation potential of ashes of different origin. The ashes were characterized using X-ray fluorescence, X-ray diffraction, and scanning electron microscopy coupled with energy-dispersive spectroscopy. Hydraulic reactivity was evaluated by preparing ash pastes at a 1:1 water-to-ash ratio and monitoring hydration product formation over time using XRD. Carbonation of co-combustion ash was studied under controlled CO₂ conditions (2 % CO₂, 50 % RH, 20 °C ± 1 °C) at different moisture contents (0 wt.%, 10 wt.%, 20 wt.%, and 40 wt.%) and early curing times (0 hours, 1 hours, 4 hours, and 24 hours).Results indicate distinct differences among the ashes. Paper sludge ash exhibited the most extensive formation of calcium aluminate hydrates, coal and co-combustion ashes showed moderate hydration, while biomass ash produced only minor secondary phases. Carbonation of co-combustion ash proceeded concurrently with hydration, with lime depletion and calcite formation enhanced by higher moisture and longer curing. These coupled processes influenced both the kinetics and composition of hydration products. The findings demonstrate the potential of diverse combustion ashes for valorisation in construction materials and provide insight into their reactivity under early-age hydration and carbonation conditions, supporting circular economy initiatives.
Keywords: circular economy, ashes from combustion, hydraulic activity, carbonation, phase composition, amorphous phase
Published in DiRROS: 14.01.2026; Views: 294; Downloads: 184
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6. The formation and properties of large-surface-area intergranular mesoporous Al2O3 particlesKlara Šparlek, Romana Cerc Korošec, Goran Dražić, Anton Meden, Erika Švara Fabjan, 2025, original scientific article Abstract: Mesoporous γ-Al2O3 with pores formed between nanocrystals was synthesized via the hydrothermal method, varying the ethanolamines (monoethanolamine, diethanolamine, triethanolamine), pH values (6.5, 7.5, 8.5) and the temperature of the thermal treatment. Characterization techniques, including nitrogen physisorption, X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric-differential scanning calorimetry-mass spectrometry (TG-DSC-MS), and transmission electron microscopy (TEM), were employed to study the textural and structural properties of the materials. Thermal treatment at 500 ◦C produced mesoporous γ-Al2O3 with pores formed between nanoparticles. The materials synthesized with triethanolamine exhibited the narrowest pore size distribution and the highest specific surface area, particularly at higher pH values. The thermal treatment temperature significantly influenced the textural properties and crystallinity, with γ-Al2O3 retained up to 900 ◦C and the transformation to non-porous α-Al2O3 occurring at 1300 ◦C. These results demonstrate the critical role of synthesis parameters in understanding and optimizing the pore size and phase stability of mesoporous alumina.
Keywords: mesoporous Al2O3, hydrothermal method, intergranular porosity, ethanolamines, influence of pH, temperature of thermal treatment
Published in DiRROS: 17.11.2025; Views: 428; Downloads: 341
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7. Nanostructure-induced functional combination of vanishing magnetostriction and magnetic softness in ferromagnetic ▫$(GaNi)_xCoCrFe (x = 0.4–1.6)$▫ high-entropy alloysJože Luzar, Andreja Jelen, Juraj Nálepka, Saeid Salari, Primož Koželj, Stanislav Vrtnik, Peter Mihor, Julia Petrović, Magdalena Wencka, Goran Dražić, Anton Meden, Janez Dolinšek, 2024, original scientific article Keywords: multi-phase alloys, multi-scale structured materials, magnetic softness, nanomagnetism
Published in DiRROS: 25.09.2025; Views: 571; Downloads: 312
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10. Periodic anti-phase boundaries and crystal superstructures in ▫$PtCu_3$▫ nanoparticles as fuel cell electrocatalystsAna Rebeka Kamšek, Anton Meden, Iztok Arčon, Primož Jovanovič, Martin Šala, Francisco Ruiz-Zepeda, Goran Dražić, Miran Gaberšček, Marjan Bele, Nejc Hodnik, 2023, original scientific article Published in DiRROS: 28.08.2023; Views: 1755; Downloads: 931
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