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Racolta D, Andronache C, Balasoiu M, Mihaly-Cozmuta L, Sikolenko V, Orelovich O, Rogachev A, Borodi G, Iepure G. Influence of the Structure on Magnetic Properties of Calcium-Phosphate Systems Doped with Iron and Vanadium Ions. Int J Mol Sci 2023; 24:ijms24087366. [PMID: 37108531 PMCID: PMC10138750 DOI: 10.3390/ijms24087366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 04/10/2023] [Accepted: 04/11/2023] [Indexed: 04/29/2023] Open
Abstract
The aim of this study was to prepare and characterize the glasses made of x(Fe2O3∙V2O5)∙(100 - x)[P2O5∙CaO] with x ranging of 0-50%. The contribution of Fe2O3 and V2O5 amount on the structure of P2O5·CaO matrix was investigated. The vitreous materials were characterized by XRD (X-ray diffraction analysis), EPR (Electron Paramagnetic Resonance) spectroscopy, and magnetic susceptibility measurements. A hyperfine structure typical for isolated V4+ ions was noticed to all spectra containing low amount of V2O5. The XRD spectra show the amorphous nature of samples, apart x = 50%. An overlap of the EPR spectrum of a broad line without the hyperfine structure characteristic of clustered ions was observed with increasing V2O5 content. The results of magnetic susceptibility measurements explain the antiferromagnetic or ferromagnetic interactions expressed between the iron and vanadium ions in the investigated glass.
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Affiliation(s)
- Dania Racolta
- Faculty of Sciences, North University Center Baia Mare, Technical University of Cluj Napoca, 430122 Baia Mare, Romania
| | - Constantin Andronache
- Faculty of Sciences, North University Center Baia Mare, Technical University of Cluj Napoca, 430122 Baia Mare, Romania
| | - Maria Balasoiu
- Joint Institute for Nuclear Research, Dubna 141980, Russia
- Horia Hulubei National Institute of Physics and Nuclear Engineering, 077125 Magurele, Romania
- R&D CSMBA, Faculty of Physics, West University of Timisoara, 300223 Timișoara, Romania
| | - Leonard Mihaly-Cozmuta
- Faculty of Sciences, North University Center Baia Mare, Technical University of Cluj Napoca, 430122 Baia Mare, Romania
| | - Vadim Sikolenko
- Joint Institute for Nuclear Research, Dubna 141980, Russia
- Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
- REC "Functional Materials", Immanuel Kant Baltic Federal University, Kaliningrad 236016, Russia
| | - Oleg Orelovich
- Joint Institute for Nuclear Research, Dubna 141980, Russia
| | - Andrey Rogachev
- Joint Institute for Nuclear Research, Dubna 141980, Russia
- Moscow Institute of Physics and Technology, Dolgoprudniy 141701, Russia
| | - Gheorghe Borodi
- National Institute for Research and Development of Isotopic and Molecular Technologies, 400293 Cluj-Napoca, Romania
| | - Gheorghe Iepure
- Faculty of Sciences, North University Center Baia Mare, Technical University of Cluj Napoca, 430122 Baia Mare, Romania
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Kot P, Baczmański A, Wroński M, Wroński S, Scheffzük C, Bokuchava G, Sikolenko V. Mechanisms of elastic–plastic deformation in magnesium alloy studied using neutron diffraction and crystallite group method. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s0108767321094629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Muench F, El-Nagar GA, Tichter T, Zintler A, Kunz U, Molina-Luna L, Sikolenko V, Pasquini C, Lauermann I, Roth C. Conformal Solution Deposition of Pt-Pd Titania Nanocomposite Coatings for Light-Assisted Formic Acid Electro-Oxidation. ACS Appl Mater Interfaces 2019; 11:43081-43092. [PMID: 31647212 DOI: 10.1021/acsami.9b12783] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Many nanofabrication processes require sophisticated equipment, elevated temperature, vacuum or specific atmospheric conditions, templates, and exotic chemicals, which severely hamper their implementation in real-world applications. In this study, we outline a fully wet-chemical procedure for equipping a 3D carbon felt (CF) substrate with a multifunctional, titania nanospike-supported Pt-Pd nanoparticle (Pt-Pd-TiO2@CF) layer in a facile and scalable manner. The nanostructure, composition, chemical speciation, and formation of the material was meticulously investigated, evidencing the conformal coating of the substrate with a roughened layer of nanocrystalline rutile spikes by chemical bath deposition from Ti3+ solutions. The spikes are densely covered by bimetallic nanoparticles of 4.4 ± 1.1 nm in size, which were produced by autocatalytic Pt deposition onto Pd seeds introduced by Sn2+ ionic layer adsorption and reaction. The as-synthesized nanocomposite was applied to the (photo)electro-oxidation of formic acid (FA), exhibiting a superior performance compared to Pt-plated, Pd-seeded CF (Pt-Pd@CF) and commercial Pt-C, indicating the promoting electrocatalytic role of the TiO2 support. Upon UV-Vis illumination, the performance of the Pt-Pd-TiO2@CF electrode is remarkably increased (22-fold), generating a current density of 110 mA cm-2, distinctly outperforming titania-free Pt-Pd@CF (5 mA cm-2) and commercial Pt-C (6 mA cm-2) reference catalysts. In addition, the Pt-Pd-TiO2@CF showed a much better stability, characterized by a very high poisoning tolerance for in situ-generated CO intermediates, whose formation is hindered in the presence of TiO2. This overall performance boost is attributed to a dual enhancement mechanism (∼30% electrocatalytic and ∼70% photoelectrocatalytic). The photogenerated electrons from the TiO2 conduction band enrich the electron density of the Pt nanoparticles, promoting the generation of active oxygen species on their surfaces from adsorbed oxygen and water molecules, which facilitate the direct FA electro-oxidation into CO2.
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Affiliation(s)
- Falk Muench
- Department of Materials and Earth Sciences , Technische Universität Darmstadt , Alarich-Weiss-Straße 2 , 64287 Darmstadt , Germany
| | - Gumaa A El-Nagar
- Chemistry Department, Faculty of Science , Cairo University , Cairo 12613 , Egypt
- Helmholtz-Zentrum Berlin für Materialien und Energie , Berlin 12489 , Germany
| | | | - Alexander Zintler
- Department of Materials and Earth Sciences , Technische Universität Darmstadt , Alarich-Weiss-Straße 2 , 64287 Darmstadt , Germany
| | - Ulrike Kunz
- Department of Materials and Earth Sciences , Technische Universität Darmstadt , Alarich-Weiss-Straße 2 , 64287 Darmstadt , Germany
| | - Leopoldo Molina-Luna
- Department of Materials and Earth Sciences , Technische Universität Darmstadt , Alarich-Weiss-Straße 2 , 64287 Darmstadt , Germany
| | | | | | - Iver Lauermann
- Helmholtz-Zentrum Berlin für Materialien und Energie , Berlin 12489 , Germany
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Sikolenko V, Troyanchuk I, Bushinsky M, Efimov V, Keller L, White JS, Schilling FR, Schorr S. High pressure induced spin state crossover in Sr2CaYCo4O10.5. J Phys Condens Matter 2015; 27:046005. [PMID: 25567194 DOI: 10.1088/0953-8984/27/4/046005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The layered cobaltite Sr(2)CaYCo(4)O(10.5) with formal average cobalt oxidation state close to 3+ has been studied as functions of both temperature and pressure up to 4 GPa by neutron powder diffraction (NPD). The crystal structure is shown to have tetragonal symmetry (space group I4/mmm; 2a(p) × 2a(p) × 4a(p) superstructure), and the magnetic structure at ambient pressure is found to be G-type antiferromagnetic with TN close to 310 K. The magnetic moments within the CoO(6) octahedral layers and anion-deficient CoO(4.5) layers are 1.2μ(B) and 2.8μ(B), respectively. At 25 K, and applied pressure of 3.5 GPa is sufficient to completely suppress a long-range magnetic order. This result is interpreted in terms of a pressure-induced high-to-low spin state crossover of the Co(3+) ions.
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Affiliation(s)
- V Sikolenko
- Helmholtz-Zentrum Berlin, 14109 Berlin, Germany. Joint Institute for Nuclear Research, 141980 Dubna, Russia. Institute of Applied Geosciences, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
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Troyanchuk IO, Karpinsky D, Efimov V, Sikolenko V, Prokhnenko O, Bartkowiak M. Ferromagnetic interactions in Mn3+ based perovskites. J Phys Condens Matter 2014; 26:396002. [PMID: 25204667 DOI: 10.1088/0953-8984/26/39/396002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
La0.7Sr0.3Mn(3+)0.85Sb(5+)0.15O3 and La0.7Sr0.3Mn(3+)0.8Sb(5+)0.1Ge(4+)0.1O3 compounds with dominantly isovalent Mn3+ ions were studied by neutron powder diffraction and magnetization measurements. The compounds are basically ferromagnetic, with magnetic moments slightly above of 3 μB/Mn. Upon temperature decrease, the compounds exhibit structural transition from a rhombohedral phase to orbitally disordered orthorhombic one. The structural transitions occur well above the temperature of magnetic ordering (Tc ≈ 130 K). It is suggested that the ferromagnetic state is governed by the positive part of superexchange interactions Mn(3+)‒O‒Mn(3+), which is enhanced by Mn(eg)‒O(2p) hybridization.
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Affiliation(s)
- I O Troyanchuk
- Scientific-Practical Materials Research Centre NAS of Belarus, 220072 Minsk, Belarus
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Karpinsky DV, Troyanchuk IO, Lobanovsky LS, Chobot AN, Ritter C, Efimov V, Sikolenko V, Kholkin AL. Magnetic and structural phase transitions in La0.5Sr0.5CoO(3-δ) (0 ≤ δ < 0.3) cobaltites. J Phys Condens Matter 2013; 25:316004. [PMID: 23838391 DOI: 10.1088/0953-8984/25/31/316004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The evolution of the crystal structure and the magnetic properties was investigated in the La0.5Sr0.5CoO(3-δ) (0 < δ < 0.3) system as a function of the oxygen deficit δ. Compounds with a low oxygen deficit (δ < 0.1) are shown to be predominantly ferromagnetic, while further increase (δ > 0.1) gradually changes the magnetic structure from ferromagnetic to G-type antiferromagnetic and causes a structural transition from rhombohedral to cubic symmetry. Resistivity and magnetoresistance at low temperature increase with increasing of oxygen vacancies. It is argued that oxygen reduction facilitates stabilization of the high spin state of Co(3+) ions. Antiferromagnetic interactions between cobalt ions in the high spin state are found to dominate in compounds with the oxygen deficit δ > 0.18.
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Affiliation(s)
- D V Karpinsky
- CICECO/Department of Materials and Ceramics Engineering, University of Aveiro, Aveiro, Portugal.
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Khomchenko VA, Troyanchuk IO, Többens DM, Sikolenko V, Paixão JA. Composition- and temperature-driven structural transitions in Bi(1-x)Ca(x)FeO3 multiferroics: a neutron diffraction study. J Phys Condens Matter 2013; 25:135902. [PMID: 23470681 DOI: 10.1088/0953-8984/25/13/135902] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Neutron powder diffraction and magnetization measurements of the Bi(1-x)Ca(x)FeO3 (0.05 ≤ x ≤ 0.14) compounds were carried out to follow the effect of the heterovalent A-site doping on the long-range structure and magnetic properties of the BiFeO3 multiferroic. Ca substitution induces the appearance of weak ferromagnetism in the initial ferroelectric R3c phase, but modifies the picture of polar displacements, so the average PbZrO3-like antiferroelectric structure is stabilized at x = 0.11. Further increase of the Ca content leads to transformation of the antipolar ionic shifts to give rise to the Pbam → Imma transition near x = 0.14. A structural study performed for the x = 0.05 compound at high temperature revealed the R3c → Pnma phase transition at 950 K. For x = 0.1 samples, an intermediate heating-induced structure separating the R3c and Pnma phases was found.
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Affiliation(s)
- V A Khomchenko
- CEMDRX/Department of Physics, University of Coimbra, Coimbra, Portugal
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Yaouanc A, Dalmas de Réotier P, Bonville P, Hodges JA, Glazkov V, Keller L, Sikolenko V, Bartkowiak M, Amato A, Baines C, King PJC, Gubbens PCM, Forget A. Dynamical splayed ferromagnetic ground state in the quantum spin ice Yb(2)Sn(2)O(7). Phys Rev Lett 2013; 110:127207. [PMID: 25166842 DOI: 10.1103/physrevlett.110.127207] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Revised: 01/24/2013] [Indexed: 06/03/2023]
Abstract
From magnetic, specific heat, (170)Yb Mössbauer effect, neutron diffraction, and muon spin relaxation measurements on polycrystalline Yb(2)Sn(2)O(7), we show that below the first order transition at 0.15 K all of the Yb(3+) ions are long-range magnetically ordered and each has a moment of 1.1 μ(B) which lies at ≃ 10° to a common fourfold cubic axis. The four sublattice moments have four different directions away from this axis and are therefore noncoplanar. We term this arrangement splayed ferromagnetism. This ground state has a dynamical component with a fluctuation rate in the megahertz range. The net ferromagnetic exchange interaction has an anisotropy that favors the local threefold axis. We discuss our results in terms of the phase diagram proposed by Savary and Balents [Phys. Rev. Lett. 108, 037202 (2012)] for a pyrochlore lattice of Kramers 1/2 effective spins.
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Affiliation(s)
- A Yaouanc
- Institut Nanosciences et Cryogénie, SPSMS, CEA and Université Joseph Fourier, F-38054 Grenoble, France
| | - P Dalmas de Réotier
- Institut Nanosciences et Cryogénie, SPSMS, CEA and Université Joseph Fourier, F-38054 Grenoble, France
| | - P Bonville
- CEA/DSM, Institut Rayonnement Matière de Saclay, SPEC, 91191 Gif-sur-Yvette, France
| | - J A Hodges
- CEA/DSM, Institut Rayonnement Matière de Saclay, SPEC, 91191 Gif-sur-Yvette, France
| | - V Glazkov
- Institut Nanosciences et Cryogénie, SPSMS, CEA and Université Joseph Fourier, F-38054 Grenoble, France and P.L. Kapitza Institute for Physical Problems, RAS, 119334 Moscow, Russia
| | - L Keller
- Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland
| | - V Sikolenko
- Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland
| | - M Bartkowiak
- Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland
| | - A Amato
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland
| | - C Baines
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland
| | - P J C King
- Rutherford Appleton Laboratory, ISIS Facility, Chilton OX11 0QX, United Kingdom
| | - P C M Gubbens
- FAME, R3, Applied Sciences, Delft University of Technology, 2629JB Delft, The Netherlands
| | - A Forget
- CEA/DSM, Institut Rayonnement Matière de Saclay, SPEC, 91191 Gif-sur-Yvette, France
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Sikolenko V, Efimov V, Efimova E, Sazonov A, Ritter C, Kuzmin A, Troyanchuk I. Neutron diffraction studies of structural and magnetic properties of niobium doped cobaltites. J Phys Condens Matter 2009; 21:436002. [PMID: 21832448 DOI: 10.1088/0953-8984/21/43/436002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Neutron powder diffraction studies of the structural and magnetic properties of the La(1-x)Sr(x)Nb(y)Co(1-y)O(3) solid solutions (x = 0.2, 0.5; y = 0, 0.075, 0.1) have been performed. Substitution of Co(2+) by Nb(5+) prevents the formation of Co(4+) and leads to stabilization of the Co(3+) ions in the high- or intermediate-spin state. This is accompanied by the significant change of the Co-O bond length as well as Co-O-Co bond angle in the CoO(6) octahedron. The obtained data are in agreement with the negative sign of the magnetic exchange interactions Co(3+)-O-Co(3+) in a relatively wide range of the Co-O-Co bond angles. Diamagnetic dilution by the niobium ions prevents long-range magnetic ordering and strongly increases magnetoresistance at low temperature.
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Affiliation(s)
- V Sikolenko
- Laboratory of Neutron Scattering, ETH Zürich and Paul Scherrer Institute, Villigen, CH-5232, Switzerland
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Sikolenko V, Pomjakushina E, Cervellino A, Senyshyn A. Neutron diffraction study of magnetic ordering in Ce(Mn 1−xFe x) 2Ge 2. Acta Crystallogr A 2009. [DOI: 10.1107/s010876730909549x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Efimov V, Efimova E, Karpinsky D, Kochubey DI, Kriventsov V, Kuzmin A, Molodtsov S, Sikolenko V, Tiutiunnikov S, Troyanchuk IO, Shmakov AN, Vyalikh D. XAFS and neutron diffraction study of the La1–xSrxCoO3. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pssc.200673874] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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