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Magnetic Properties of Yttrium-Substituted NiZn Ferrites

100%
Jančárik V., Ušák E., Šoka M., Ušáková M.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
90-91
EN
Polycrystalline NiZn ferrite doped with a small amount of Y^{3+} ions and having the composition of Ni_{0.42}Zn_{0.58}Y_{x}Fe_{2-x}O_{4}, where x=0.00, 0.01, 0.02, 0.04, 0.06, 0.08 and 0.10, was analyzed. Specimens were prepared by the ceramic method. Thermo-magnetic analysis and evaluation of hysteresis loops parameters were chosen as main examination methods in this study. Various parameters, such as Curie temperature T_{C}, coercive field H_{c}, remanent magnetic flux density B_{r}, hysteresis loop area and amplitude/initial permeability were studied at low frequencies.
2
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Nickel/Zinc Ratio and Lanthanum Substitution Effect on Structural and Magnetic Properties of Nickel Zinc Ferrites

100%
Jančárik V., Šoka M., Ušáková M., Harťanský R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
693-695
EN
Improvement of NiZn ferrites properties by means on Ni/Zn content ratio modification and by partial substitution of Fe³⁺ ions by La³⁺ ions is presented. Ni_{x}Zn_{1-x}Fe₂O₄ and Ni_{x}Zn_{1-x}La_{0.02}Fe_{1.98}O₄ samples of small particles were prepared by self-propagated combustion method. X-ray spectroscopy was used for structural analysis, temperature dependence of magnetic susceptibility was used for evaluation of chemical and phase composition. Analysis showed that pure spinel structure without secondary phase caused by La ions for all values of Ni/Zn content was present. Noticeable growth of the magnetic susceptibility at room temperature was observed with rising of Zn²⁺ ions content.
3
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Optimization of Magnetic and Structural Properties of Sr Ferrite Prepared by Low-Temperature Combustion

100%
Grusková A., Jančárik V., Sláma J., Ušáková M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
557-560
EN
Fine strontium hexaferrite particles were prepared by the low temperature auto-combustion method. Aqueous solution of the corresponding metal salts and a combustible co-reactant compound - glycine were used as initial precursor. The resulting powders were calcined at various temperatures from 750°C up to 1100°C. The microstructure and magnetic properties were investigated by the Mössbauer spectroscopy, thermomagnetic analysis, scanning electron microscopy, and vibrating magnetometer. The particles of sizes less than 1 μm have monophasic hexagonal structure. Coercivity H_c≈400 kA/m, specific saturation polarization J_{s-m} ≈ 72×10^{-6} Tm^3 kg^{-1} and remanence polarization J_{s-r} ≈ 43×10^{-6} T m^3 kg^{-1} were achieved for the Sr ferrite annealed at 850°C for 6 h.
4
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Hopkinson Effect in Soft and Hard Magnetic Ferrites

88%
Sláma J., Ušáková M., Šoka M., Dosoudil R., Jančárik V.
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EN
The dependences of the susceptibility of selected spinel and hexagonal ferrites on temperature are analyzed. The susceptibility shows a peak just below the Curie temperature T_{C} due to the Hopkinson effect during the heating. The appearance of this effect is associated with a transition from the region of stable magnetization state to superparamagnetic relaxations of the magnetic particles. It is in contrast to other explanations of the Hopkinson effect. These results are compared with measured particles size and with scanning electron microscope micrographs of both types of ferrites.
5
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Electromagnetic Properties of Substituted Barium Hexaferrites

88%
Sláma J., Grusková A., Jančárik V., Štofka M., González-Angeles A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
609-612
EN
Substituted M-type ferrite BaFe_{12-2x}(Me_1Me_2)_xO_{19}, 0≤x≤0.6 was prepared by both mechanical alloying and precursor method, where Me_1 = Co, Ni, Zn, Sn and Me_2 =Ru, Ti, Zr, Sn. Magnetic phase purity, change of saturation polarization, Curie temperature, coercivity and magnetic susceptibility was studied as function of x. Attention was focused to results obtained for (NiRu)_x, (ZnRu)_x, and (SnRu)_x mixtures with low doping ratio x.
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