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Magnetic Properties of Nano-Crystalline Barium Ferrite Synthesized by Different Synthesis Route

100%
Ovalioglu H., Sozeri H., Kabaer M., Kucuk I.
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issue 5
1020-1021
EN
We have synthesized Ba_{1-x}La_{x}Fe_{12}O_{19} (0 ≤ x ≤ 0.4) and BaFe_{12-y}Nd_{y}O_{19} (0 ≤ y ≤ 4) samples in ammonium nitrate melt and nitric acid. The effects of La and Nd doping on the microstructure and magnetic properties of BaFe_{12}O_{19} were investigated. The highest coercive field was obtained for the sample having La content, x = 0.3.
2
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Computational Modeling of Magnetic Properties and Glass Forming Ability of Bulk Amorphous Materials

100%
Kabaer M., Ovalioglu H., Kucuk I.
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issue 5
827-828
EN
A model based on artificial neural network was designed for the simulation and estimation of glass forming ability parameters and saturation magnetization and coercivity of bulk glassy alloys. Its performance is evaluated by the influences of different kinds of alloys and elements on the glass forming ability and magnetic properties. The values of glass forming ability parameters and saturation magnetization and coercivity values estimated by artificial neural network agree well with the experimental values, indicating that the model is reliable and adequate.
3
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Intermolecular Magnetic Spin-Spin Interaction in Asphaltene Suspensions at 1.53 mT

100%
Ovalioglu H., Kirimli H., Akay C.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
806-809
EN
In this study, Overhauser effect (OE) type of dynamic nuclear polarization (DNP) experiments were performed to study suspensions of MC800 asphaltene in bromopentafluorobenzene, chloropentafluorobenzene and hexafluorobenzene aromatic solvents. The experiments were performed at a low field of 1.53 mT in a double-resonance nuclear magnetic resonance (NMR) spectrometer. In this technique the nuclei of diffusing solvent molecules and the unpaired electron existing on the asphaltene micelles interact magnetically. The DNP parameters were determined. Additionally, the interactions between ¹⁹F nuclei of the solvent and the electrons delocalized on the asphaltene are interpreted. The highest enhancement factor value (5.90) was obtained for the hexafluorobenzene solvent medium, because between these, hexafluorobenzene has the highest fluorine atom number. The solvent molecules attach to the colloidal asphaltene particles for a very short time forming complexes and making scalar interaction. Morphologies of asphaltene surfaces depending on the solvent effects were observed by using scanning electron microscopy (SEM).
4
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Intermolecular Effects of Fluorocarbons on MC800 Asphaltene and their Characterization

100%
Kirimli H., Ovalioglu H., Akay C.
Acta Physica Polonica A
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2017
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vol. 131
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issue 3
336-338
EN
Nuclear magnetic resonance and dynamic nuclear polarization experiments were performed to study suspensions of asphaltene in the fluorocarbons at a low magnetic field of 1.53 mT, at room temperature. The asphaltene was extracted from MC800 liquid asphalt, which was of Heavy Iran origin. The elemental composition and the surface morphology of the asphaltene were determined by scanning electron microscopy and energy dispersive X-ray analysis. Intermolecular spin-spin interactions occur between nuclear spins of hydrogen in the solvent medium and the free electron spins in the asphaltene micelles. The electron paramagnetic resonance spectrum of the asphaltene was obtained and the saturation experiments were applied to the samples prepared in vacuum. The main ¹H DNP parameters were listed. Chemical composition and molecular structure of the asphaltene were analyzed. Scanning electron microscope images have shown that asphaltenes are constituted of agglomerated particles and smooth surfaces. Energy dispersive X-ray analysis has shown that the most abundant element is carbon.
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