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NdFeB Permanent Magnets with Various Nd Content

100%
Žák T., Talijan N., Ćosović V., Grujić A.
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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.
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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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Polymer - Bonded Magnetic Materials with Various Nd-Fe-B Filler Content

76%
Grujić A., Lazić N., Talijan N., Spasojević V., Stajić-Trošić J., Ćosović V., Aleksić R.
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2010
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vol. 117
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issue 5
859-863
EN
One of the more important developments in magnetic materials, polymer bonded magnets, have opened a new world of application opportunities. The Nd-Fe-B/polymer composite materials offer an excellent combination of strong magnetic and dynamical-mechanical properties. However, the transition temperatures of filler and matrix should be selected carefully considering the future application. Uniform particle distribution and good adhesion between Nd-Fe-B powder particles and polymer are essential for the quality of the composite, while stiffness of polymer matrix is one of the influencing factors as well. The damping properties of Nd-Fe-B/polymer composites with 15 wt.%, 50 wt.% and 75 wt.% of Nd-Fe-B powder were studied by dynamic mechanical analysis and compared with a pure polymer sample. Thermal stability was analyzed using a simultaneous differential scanning calorimetric and thermogravimetric analysis technique.
4
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Thermal, Structural and Electrical Properties of Some Bi-Cu-Ni Alloys

76%
Marković B., Živković D., Manasijeyić D., Sokić M., Minić D., Talijan N., Stajić-Trošić J.
Archives of Metallurgy and Materials
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2014
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issue 1
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.
Acta Physica Polonica A
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2014
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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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