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1
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NdFeB Permanent Magnets with Various Nd Content

100%
Žák T., Talijan N., Ćosović V., Grujić A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
279-282
EN
Three kinds of commercial Nd-Fe-B based materials were compared using ^{57}Fe Mössbauer spectroscopy and X-ray analysis: near the Nd_2Fe_{14}B stoichiometry and with both lowered and raised Nd content. Magnetically hard Nd_2Fe_{14}B is present in all three materials. In the Nd-low material it is accompanied with the magnetically soft Fe_3B phase, building the nanocomposite structure. In the Nd-rich sample the overstoichiometric Nd atoms seem to build separate phase of Fe-Nd solid solution. None of the materials contain significant content of phases degrading magnetic characteristics, with except of minor Nd_{1.1}Fe_4B_4 one.
2
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Thermomagnetic Behaviour and Microstructure of a Rapidly Quenched Nd_{4.5}Fe_{77}B_{18.5} Alloy

88%
Talijan N., Ćosović V., Grujić A., Stajić-Trošić J., Žák T.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
525-528
EN
Changes in the phase composition and crystallite size, as well as changes in the magnetic behaviour of Nd_{4.5}Fe_{77}B_{18.5} alloy, caused by thermomagnetic measurements, was observed in regard of the optimal magnetic state of this alloy. In the optimized magnetic state, the formed nanocomposite consisted of Fe_3B/Nd_2Fe_{14}B and partly of α-Fe with a mean crystallite size < 30 nm, as determined by X-ray diffraction and transmission electron microscopy. An increased amount of α-Fe, the presence of Nd_2O_3 and different Fe-B phases, as well as an increase in the mean crystallite size were observed after thermomagnetic measurements had caused a quality loss of the hard magnetic properties.
3
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Thermal Stability and Mechanism of Thermally Induced Crystallization of Fe_{73.5}Cu₁Nb₃Si_{15.5}B₇ Amorphous Alloy

76%
Vasić M., Minić D., Blagojević V., Žák T., Pizúrová N., David B., Minić D.
Acta Physica Polonica A
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2015
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vol. 128
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issue 4
657-660
EN
Investigation of thermal stability of the alloy revealed stepwise crystallization process, manifested by two distinct complex exothermic peaks in differential scanning calorimetry curves. Kinetic parameters of individual crystallization steps were found using the Kissinger and Vyazovkin methods. Structural characterization of thermally treated samples showed formation of different iron-based phases including α-Fe(Si), Fe₂B, Fe₁₆Nb₆Si₇ and Fe₂Si and some metastable intermediary species. Morphology characterization of the surface and cross-section of the thermally treated samples showed granulated structure composed of several different phases and indicated occurrence of impingement effects during crystal growth. Value of estimated lifetime suggested very high stability against crystallization at room temperature and abrupt decrease of lifetime with temperature increase.
4
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Magnetic Interactions between Nanoparticles Formed during Calcination of Ferrihydrite

76%
Schneeweiss O., David B., Žák T., Filip J., Tuček J., Zbořil R., Mašláň M.
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issue 5
749-750
EN
Magnetic interactions between nanoparticles of magnetite Fe_3O_4 and α-Fe formed during calcination of ferrihydrite in H_2 at temperatures 533 ÷ 713 K were studied. The detailed phase analysis describes evolution of contents of magnetite and α-Fe. Explanation of an anomalous course of magnetic moment characterized by a local maximum at an early stage of formation of nanoparticles is discussed.
5
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Structure and Magnetic Properties of Nanocrystalline NiFe_{2}O_{4} Prepared via Precipitation Route

76%
Žák T., David B., Ćosović A., Ćosović V., Živković D., Talijan N.
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vol. 126
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issue 1
142-143
EN
Nanocrystalline Ni-ferrite was synthesized by modified precipitation method in which soluble starch is used as dispersing agent and Na_{2}CO_{3} as a precipitating agent. NiSO_{4}·6H_{2}O and Fe(NO_{3})_{3}·9H_{2}O were used as precursors for nickel and ferric oxide, respectively. The obtained nanocrystalline Ni-ferrite was analysed and discussed through structural, compositional and magnetic characterization. Formation of pure NiFe_{2}O_{4} phase with average crystallite size of 21 nm has been confirmed by X-ray diffraction analysis (XRD). The determined phase composition was additionally supported by results of ^{57}Fe Mössbauer phase (MS) analysis and material's nanocrystalline structure by field emission scanning electron microscopy (FE-SEM). Thermomagnetic behaviour was studied up to 800 °C. The obtained room temperature magnetic hysteresis loop, recorded by means of a vibrating sample magnetometer (VSM), exhibits characteristic "S" shape of the soft magnetic material with the measured coercivity of about 10 kA/m and the specific moment up to 40 Am^{2}/kg.
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