TY - JOUR AU - Stichleutner, Sándor AU - Herczeg, Bence AU - Pechoušek, Jiří AU - Machala, Libor AU - Homonnay, Zoltán AU - Smrčka, David AU - Kouřil, Lukáš AU - Vondrášek, René AU - Kudor, Mátyás AU - Skuratov, Vladimir A. AU - Krupa, Luboš AU - Kubuki, Shiro AU - Kuzmann, Ernő TI - Change in Superparamagnetic State Induced by Swift Heavy Ion Irradiation in Nano-Maghemite JF - METALS J2 - METALS-BASEL VL - 14 PY - 2024 IS - 4 SN - 2075-4701 DO - 10.3390/met14040421 UR - https://m2.mtmt.hu/api/publication/34776265 ID - 34776265 AB - The effect of swift heavy ion irradiation on sol–gel-prepared maghemite nanoparticles was studied by 57Fe transmission Mössbauer spectroscopy and X-ray diffractometry (XRD). The room temperature Mössbauer spectra of the non-irradiated nano-maghemite showed poorly resolved magnetically split, typical relaxation spectra due to the superparamagnetic state of the nanoparticles. Significant changes in the line shape, indicating changes in the superparamagnetic state, were found in the Mössbauer spectra upon irradiation by 160 MeV and 155 MeV 132Xe26+ ions with fluences of 5 × 1013 ion cm−2 and 1 × 1014 ion cm−2. XRD of the irradiated maghemite nanoparticles showed a significant broadening of the corresponding lines, indicating a decrease in the crystallite size, compared to those of the non-irradiated ones. The results are discussed in terms of the defects induced by irradiation and the corresponding changes related to the change in particle size and consequently in the superparamagnetic state caused by irradiation. LA - English DB - MTMT ER - TY - JOUR AU - Ibrahim, Ahmed AU - Tani, Kaoru AU - Hashi, Kanae AU - Zhang, Bofan AU - Homonnay, Zoltán AU - Kuzmann, Ernő AU - Bafti, Arijeta AU - Pavić, Luka AU - Krehula, Stjepko AU - Marciuš, Marijan AU - Kubuki, Shiro TI - Debye Temperature Evaluation for Secondary Battery Cathode of α-SnxFe1−xOOH Nanoparticles Derived from the 57Fe- and 119Sn-Mössbauer Spectra JF - INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES J2 - INT J MOL SCI VL - 25 PY - 2024 IS - 5 SN - 1661-6596 DO - 10.3390/ijms25052488 UR - https://m2.mtmt.hu/api/publication/34684508 ID - 34684508 AB - Debye temperatures of α-SnxFe1−xOOH nanoparticles (x = 0, 0.05, 0.10, 0.15 and 0.20, abbreviated as Sn100x NPs) prepared by hydrothermal reaction were estimated with 57Fe- and 119Sn-Mössbauer spectra measured by varying the temperature from 20 to 300 K. Electrical properties were studied by solid-state impedance spectroscopy (SS-IS). Together, the charge–discharge capacity of Li- and Na-ion batteries containing Sn100x NPs as a cathode were evaluated. 57Fe-Mössbauer spectra of Sn10, Sn15, and Sn20 measured at 300 K showed only one doublet due to the superparamagnetic doublet, while the doublet decomposed into a sextet due to goethite at the temperature below 50 K for Sn 10, 200 K for Sn15, and 100 K for Sn20. These results suggest that Sn10, Sn15 and Sn20 had smaller particles than Sn0. On the other hand, 20 K 119Sn-Mössbauer spectra of Sn15 were composed of a paramagnetic doublet with an isomer shift (δ) of 0.24 mm s−1 and quadrupole splitting (∆) of 3.52 mm s−1. These values were larger than those of Sn10 (δ: 0.08 mm s−1, ∆: 0.00 mm s−1) and Sn20 (δ: 0.10 mm s−1, ∆: 0.00 mm s−1), suggesting that the SnIV-O chemical bond is shorter and the distortion of octahedral SnO6 is larger in Sn15 than in Sn10 and Sn20 due to the increase in the covalency and polarization of the SnIV-O chemical bond. Debye temperatures determined from 57Fe-Mössbauer spectra measured at the low temperature were 210 K, 228 K, and 250 K for Sn10, Sn15, and Sn20, while that of α-Fe2O3 was 324 K. Similarly, the Debye temperature of 199, 251, and 269 K for Sn10, Sn15, and Sn20 were estimated from the temperature-dependent 119Sn-Mössbauer spectra, which were significantly smaller than that of BaSnO3 (=658 K) and SnO2 (=382 K). These results suggest that Fe and Sn are a weakly bound lattice in goethite NPs with low crystallinity. Modification of NPs and addition of Sn has a positive effect, resulting in an increase in DC conductivity of almost 5 orders of magnitude, from a σDC value of 9.37 × 10−7 (Ω cm)−1 for pure goethite Sn (Sn0) up to DC plateau for samples containing 0.15 and 0.20 Sn (Sn15 and Sn20) with a DC value of ~4 × 10−7 (Ω cm)−1 @423 K. This non-linear conductivity pattern and levelling at a higher Sn content suggests that structural modifications have a notable impact on electron transport, which is primarily governed by the thermally activated via three-dimensional hopping of small polarons (SPH). Measurements of SIB performance, including the Sn100x cathode under a current density of 50 mA g−1, showed initial capacities of 81 and 85 mAh g−1 for Sn0 and Sn15, which were larger than the others. The large initial capacities were measured at a current density of 5 mA g−1 found at 170 and 182 mAh g−1 for Sn15 and Sn20, respectively. It is concluded that tin-goethite NPs are an excellent material for a secondary battery cathode and that Sn15 is the best cathode among the studied Sn100x NPs. LA - English DB - MTMT ER - TY - JOUR AU - Alenkina, Irina V. AU - Chukin, Andrey V. AU - Leitus, Gregory AU - Denisova, Olga V. AU - Gracheva, Maria AU - Felner, Israel AU - Kuzmann, Ernő AU - Homonnay, Zoltán AU - Oshtrakh, Michael I. TI - ANALYSIS OF THE IRON STATES IN IRON-CONTAINING PHARMACEUTICAL PRODUCTS USING MÖSSBAUER SPECTROSCOPY JF - JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS J2 - J PHARMACEUT BIOMED ANAL VL - 237 PY - 2024 SN - 0731-7085 DO - 10.1016/j.jpba.2023.115745 UR - https://m2.mtmt.hu/api/publication/34160976 ID - 34160976 N1 - Institute of Physics and Technology, Ural Federal University, Ekaterinburg, 620002, Russian Federation Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, Israel Laboratory of Nuclear Chemistry, Institute of Chemistry, Eötvös Loránd University, Budapest, Hungary Hevesy Gyorgy Doctoral School of Chemistry, Eötvös Loránd University, Budapest, Hungary Racah Institute of Physics, The Hebrew University, Jerusalem, 91904, Israel Export Date: 16 November 2023 CODEN: JPBAD Correspondence Address: Oshtrakh, M.I.; Institute of Physics and Technology, Russian Federation; email: oshtrakh@gmail.com LA - English DB - MTMT ER - TY - JOUR AU - Oshtrakh, Michael I. AU - Alenkina, Irina V. AU - Chukin, Andrey V. AU - Kuzmann, Ernő AU - Homonnay, Zoltán TI - Comparison of two pharmaceutical products containing ferrous sulfate using Mössbauer spectroscopy JF - HYPERFINE INTERACTIONS J2 - HYPERFINE INTERACT VL - 244 PY - 2023 IS - 1 SN - 0304-3843 DO - 10.1007/s10751-023-01835-4 UR - https://m2.mtmt.hu/api/publication/34323900 ID - 34323900 LA - English DB - MTMT ER - TY - JOUR AU - Oshtrakh, Michael I. AU - Kuzmann, Ernő AU - Homonnay, Zoltán AU - Semionkin, Vladimir A. TI - Analysis of the differential nonlinearity for the velocity driving systems in Mössbauer spectrometers using thin α-Fe reference absorber JF - HYPERFINE INTERACTIONS J2 - HYPERFINE INTERACT VL - 244 PY - 2023 IS - 1 SN - 0304-3843 DO - 10.1007/s10751-023-01831-8 UR - https://m2.mtmt.hu/api/publication/34266835 ID - 34266835 LA - English DB - MTMT ER - TY - JOUR AU - Ibrahim, Ahmed AU - Watanabe, Satoshi AU - Razum, Marta AU - Pavić, Luka AU - Homonnay, Zoltán AU - Kuzmann, Ernő AU - Hassaan, Mohamed Yousry AU - Kubuki, Shiro TI - Structural, Electrical, and Electrochemical Properties of a Na2O-V2O5 Ceramic Nanocomposite as an Active Cathode Material for a Na-Ion Battery JF - CRYSTALS J2 - CRYSTALS VL - 13 PY - 2023 IS - 10 SN - 2073-4352 DO - 10.3390/cryst13101521 UR - https://m2.mtmt.hu/api/publication/34213280 ID - 34213280 AB - In this paper, a relationship between the structure and the electrical properties of a nanocrystalline composite ceramics xNa2O·(100 − x)V2O5 with ‘x’ of 5, 15, 25, 35, and 45 mol%, abbreviated as xNV, was investigated by X-ray diffractometry (XRD), X-ray absorption spectroscopy (XAS), Cyclic Voltammetry (CV), Electrochemical impedance spectroscopy (EIS), and cathode active performance in Na-ion battery (SIB). For the expected sodium vanadium bronzes (NaxV2O5) precipitation, the preparation of xNV was performed by keeping the system in the molten state at 1200 °C for one hour, followed by a temperature decrease in the electric furnace to room temperature at a cooling rate of 10 °C min−1. XRD patterns of the 15NV ceramic exhibited the formation of Na0.33V2O5 and NaV3O8 crystalline phases. Moreover, the V K-edge XANES showed that the absorption edge energy of ceramics 15NV recorded at 5479 eV is smaller than that of V2O5 at 5481 eV, evidently indicating a partial reduction from V5+ to V4+ due to the precipitation of Na0.33V2O5. In the cyclic voltammetry, reduction peaks of 15NV were observed at 1.12, 1.78 V, and 2.69 V, while the oxidation peak showed up only at 2.36 V. The values of the reduction peaks were related to the NaV3O8 crystalline phase. Moreover, the diffusion coefficient of Na+ (DNa+) gradually decreased from 8.28 × 10−11 cm2 s−1 to 1.23 × 10−12 cm2 s−1 with increasing Na2O content (x) from 5 to 45 mol%. In the evaluation of the active cathode performance of xNV in SIB, ceramics 15NV showed the highest discharge capacity 203 mAh g−1 at a current rate of 50 mA g−1. In the wider voltage range from 0.8 to 3.6 V, the capacity retention was maintained at 50% after 30 cycles, while it was significantly improved to 90% in the narrower voltage range from 1.8 to 4.0 V, although the initial capacity decreased to 56 mAh g−1. It is concluded that the precipitation of the Na0.33V2O5 phase improved the structural and electrical properties of 15NV, which provides a high capacity for the Na-ion battery when incorporated as a cathode active material. LA - English DB - MTMT ER - TY - JOUR AU - Goryunov, M. V. AU - Varga, G. AU - Dankházi, Zoltán AU - Felner, I. AU - Chukin, A. V. AU - Kuzmann, Ernő AU - Homonnay, Zoltán AU - Grokhovsky, V. I. AU - Oshtrakh, M. I. TI - STUDY OF GIBEON IVA IRON METEORITE BY SCANNING ELECTRON MICROSCOPY, X-RAY DIFFRACTION, MAGNETIZATION MEASUREMENTS AND MOSSBAUER SPECTROSCOPY JF - METEORITICS & PLANETARY SCIENCE J2 - METEORIT PLANET SCI VL - 58 PY - 2023 IS - 1 SP - A108 EP - A108 PG - 1 SN - 1086-9379 UR - https://m2.mtmt.hu/api/publication/34194400 ID - 34194400 LA - English DB - MTMT ER - TY - JOUR AU - Ibrahim, A. AU - Ali, A.S. AU - Khan, Irfan AU - Zhang, B. AU - Sinkó, Katalin AU - Homonnay, Zoltán AU - Kuzmann, Ernő AU - Krehula, S. AU - Ristić, M. AU - Musić, S. AU - Pavić, L. AU - Santić, A. AU - Kubuki, S. TI - New photo-Fenton type catalyst of soda-lime aluminosilicate glass prepared by recycling waste slag–a review JF - JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY- LETTERS J2 - J RADIOANAL NUCL CH LE (1984-1996) VL - 332 PY - 2023 SP - 3859 EP - 3878 PG - 20 SN - 0236-5731 DO - 10.1007/s10967-023-09127-5 UR - https://m2.mtmt.hu/api/publication/34188040 ID - 34188040 LA - English DB - MTMT ER - TY - JOUR AU - Goryunov, M. V. AU - Varga, G. AU - Dankházi, Zoltán AU - Chukin, A. V. AU - Felner, I. AU - Kuzmann, Ernő AU - Grokhovsky, V. I. AU - Homonnay, Zoltán AU - Oshtrakh, M. I. TI - Characterization of iron meteorites by scanning electron microscopy, x-ray diffraction, magnetization measurements, and Mossbauer spectroscopy: Mundrabilla IAB-ung JF - METEORITICS & PLANETARY SCIENCE J2 - METEORIT PLANET SCI VL - 58 PY - 2023 IS - 10 SP - 1552 EP - 1562 PG - 11 SN - 1086-9379 DO - 10.1111/maps.14070 UR - https://m2.mtmt.hu/api/publication/34181984 ID - 34181984 N1 - Institute of Physics and Technology, Ural Federal University, Ekaterinburg, Russian Federation Department of Materials Physics, Eötvös Loránd University, Budapest, Hungary Racah Institute of Physics, The Hebrew University, Jerusalem, Israel Laboratory of Nuclear Chemistry, Institute of Chemistry, Eötvös Loránd University, Budapest, Hungary Cited By :1 Export Date: 20 February 2024 CODEN: MPSCF Correspondence Address: Oshtrakh, M.I.; Institute of Physics and Technology, Russian Federation; email: oshtrakh@gmail.com AB - A fragment of Mundrabilla IAB-ung iron meteorite was analyzed using optical microscopy, scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), magnetization measurements, and Mossbauer spectroscopy. The polished section of meteorite fragment characterization by optical microscopy and SEM shows the presence of the gamma-Fe(Ni, Co) phase lamellae, plessite structures and schreibersite inclusions in the alpha-Fe(Ni, Co) phase. EDS indicates variations in the Ni concentrations in the following ranges: (i) similar to 6.3-6.5 atom% in the alpha-Fe(Ni, Co) phase and (ii) similar to 22 to similar to 45 atom% in the gamma-Fe(Ni, Co) phase lamellae including the range of similar to 29-33 atom% of Ni leading to the paramagnetic state of the gamma-Fe(Ni, Co) phase. Schreibersite inclusions contain similar to 23 atom% of P, similar to 33 atom% of Fe, similar to 43 atom% of Ni, and similar to 0.7 atom% of Co. Plessite structure contains the average Ni concentration of similar to 17 atom% while detailed EDS analysis shows: (i) the lowest Ni concentrations of similar to 5 to similar to 8 atom%, (ii) the intermediate Ni concentrations of similar to 9 to similar to 19 atom%, and (iii) the highest Ni concentration up similar to 38 atom% (some individual micro-grains demonstrate up to similar to 47 and similar to 59 atom% of Ni) that may indicate the presence of the (i) alpha-Fe(Ni, Co), (ii) alpha(2)-Fe(Ni, Co), and (iii) gamma-Fe(Ni, Co) phases. These may be a result of the c-phase decomposition with mechanism gamma -> alpha + alpha(2) + gamma that indicates a slow cooling rate for Mundrabilla IAB-ung iron meteorite. The presence of similar to 98.6 wt% of the alpha-Fe(Ni, Co) phase and similar to 1.4 wt% of the gamma-Fe(Ni, Co) phase is found by XRD while schreibersite is not detected. Magnetization measurements show the saturation magnetization moment of Mundrabilla IAB-ung of 188(2) emu g(-1) indicating a low average Ni concentration in Fe-Ni-Co alloy. Mossbauer spectrum of the bulk Mundrabilla powder demonstrates five magnetic sextets related to the ferromagnetic alpha(2)-Fe(Ni, Co), alpha-Fe(Ni, Co), and gamma-Fe(Ni, Co) phases and one singlet associated with the paramagnetic gamma-Fe(Ni, Co) phase, however, there are no spectral components corresponding to schreibersite. Basing on relatively larger and smaller values of the magnetic hyperfine field, two magnetic sextets associated with gamma-Fe(Ni, Co) phase can be related to the disordered and more ordered gamma-phases. The iron fractions in the detected phases can be roughly estimated as follows: (i) similar to 17.6% in the alpha(2)-Fe(Ni, Co) phase, (ii) similar to 68.5% in the alpha-Fe(Ni, Co) phase, (iii) similar to 11.5% in the disordered gamma-Fe(Ni, Co) phase, (iv) similar to 2.0% in the more ordered gamma-Fe(Ni, Co) phase, and (v) similar to 0.4% in the paramagnetic gamma-Fe(Ni, Co) phase. LA - English DB - MTMT ER - TY - JOUR AU - Várhelyi, Csaba, ifj. AU - Szőke, Á. AU - Sziráki, Laura AU - Tomoaia-Cotișel, M. AU - Homonnay, Zoltán AU - Szalay, Roland AU - Simon-Várhelyi, M. AU - Mereu, R.-A. AU - Pokol, György AU - Szilágyi, Imre Miklós AU - Papp, J. AU - Mihály, Judith AU - Kuzmann, Ernő TI - Fe spin states and redox processes in Schiff base type complexes JF - JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY J2 - J RADIOANAL NUCL CHEM VL - 332 PY - 2023 IS - 10 SP - 4125 EP - 4139 PG - 15 SN - 0236-5731 DO - 10.1007/s10967-023-09095-w UR - https://m2.mtmt.hu/api/publication/34107401 ID - 34107401 N1 - Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Arany János 11, Cluj-Napoca, 400028, Romania Institute of Chemistry, Eötvös Loránd University, Pázmány Péter 1/a, Budapest, 1117, Hungary Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem Rkp. 3, Budapest, 1111, Hungary Faculty of Biology and Geology, Babeş-Bolyai University, Gheorghe Bilaşcu 44, Cluj-Napoca, 400015, Romania Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, Budapest, 1117, Hungary Export Date: 29 January 2024 CODEN: JRNCD Correspondence Address: Várhelyi, C.; Faculty of Chemistry and Chemical Engineering, Arany János 11, Romania; email: csaba.varhelyi@ubbcluj.ro LA - English DB - MTMT ER -