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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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Todoran R, Todoran D, Racolta D, Szakács Z. Electrical and Optical Properties of CeNi5 Nanoscale Films. Nanoscale Res Lett 2016; 11:253. [PMID: 27184966 PMCID: PMC4870657 DOI: 10.1186/s11671-016-1477-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Accepted: 05/10/2016] [Indexed: 06/05/2023]
Abstract
Rare earth compounds are interesting from both a theoretical point of view and for their applications. That is the reason why determining their optical and electrical properties deserves special attention. In this article, we present the conditions we obtained homogenous CeNi5 thin films of nanometer thicknesses. To achieve this goal, our method of choice was laser-induced vaporization, using short and modulated impulses, with electro-optical tuning for the quality factor. The layers that were deposited at a single laser burst had thicknesses between 1.5 and 2.5 nm, depending on the geometry of the experimental setup.Structural and compositional studies of the nanoscale films were made using XRD. The temperature dependence of electrical conductivity was also determined. The following optical properties of the specimens were computed using the Kramers-Krönig framework and discussed: absolute reflection and transmission coefficients for a single wavelength and relative ones for the wide UV-VIS-IR spectra, spectral dependence of the refractive index, and extinction coefficient as real and imaginary parts of the complex refractive index. The valence band studies were made with X-ray photoelectron spectroscopy. All these determinations were well correlated and permitted the evaluation of the energy densities of states in the deeper bands, near the Fermi energy, and at the surface states.
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Affiliation(s)
- Radu Todoran
- Department of Economics and Physics, Technical University of Cluj Napoca, North University Center of Baia Mare, Dr. V. Babes Street, 62/A, Baia Mare, Romania
| | - Daniela Todoran
- Department of Economics and Physics, Technical University of Cluj Napoca, North University Center of Baia Mare, Dr. V. Babes Street, 62/A, Baia Mare, Romania
| | - Dania Racolta
- Department of Economics and Physics, Technical University of Cluj Napoca, North University Center of Baia Mare, Dr. V. Babes Street, 62/A, Baia Mare, Romania
| | - Zsolt Szakács
- Department of Economics and Physics, Technical University of Cluj Napoca, North University Center of Baia Mare, Dr. V. Babes Street, 62/A, Baia Mare, Romania.
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