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Shaped Co^(2+) doped TiO_(2) nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior

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Journal of Advanced Ceramics 2017年第3期6卷 220-229页

作者： m.VRANJES J.KULJANIN JAKOVLJEVIC Z.KONSTANTINOVIC A.POmAR m.stoiljkovic m.mITRIC T.RADETIC Z.SAPONJIC Vinca Institute of Nuclear Sciences University of BelgradeP.O.Box 52211001 BelgradeSerbia Center for Solid State Physics and New materials Institute of Physics BelgradeUniversity of BelgradePregrevica 11811080 BelgradeSerbia Institut de Ciència de materials de Barcelona CSICCampus UAB08193 BellaterraSpain Faculty of Technology and metallurgy University of BelgradeKarnegijeva 411120 BelgradeSerbia

Co2+ doped TiO2 nanocrystals were synthetized by a hydrothermal treatment procedure applied to precursor dispersion of titania nanotubes and Co2+ ions. mixture of polygonal and prolate spheroid-like nanocrystals was obtained. The results of X-ray diffraction (XRD) analysis showed that resulted nanocrystals retain anatase crystal phase for both dopant concentrations (1.69 and 2.5 at%), but the crystal lattice parameters were affected. Reflection spectra revealed altered optical properties compared to bare TiO2. Room temperature ferromagnetic ordering with saturation magnetic moment in the range of 0.001–0.002 μB /Co was observed for both measured films made of Co2+ doped TiO2 nanocrystals.

关键词： hydrothermal synthesis X-ray diffraction(XRD) transmission electron microscopy(TEm) doped TiO_(2) magnetic properties

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Influence of Ni^(2+)/Co^(2+)ratio in electrolyte on morphology,structure and magnetic properties of electrolytically produced Ni-Co alloy powders

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Transactions of Nonferrous metals Society of China 2020年第4期30卷 1046-1057页

作者： Vesna m.mAKSImOVIC Vladan B.KUSIGERSKI milovan m.stoiljkovic Jelena R.mALETASKIC NebojSa D.NIKOLIC Institute of Nuclear Sciences “Vinca”University of BelgradeP.O.Box 522Belgrade 11001Serbia Laboratory for Advanced Nuclear Energy Institute of Innovative ResearchTokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo 152-8550Japan ICTm-Department of Electrochemistry University of BelgradeNjegoseva 12P.O.Box 473Belgrade 11001Serbia

Nickel-cobalt(Ni-Co) alloy powders were produced galvanostatically by using sulphate electrolytes with various ratios of Ni2+/Co2+(mole ratios). The morphology, phase structure, chemical composition and magnetic properties were examined by scanning electron microscope(SEm), X-ray diffractometer(XRD), atomic emission spectrometer(AES), and SQUID-based magnetometer, respectively. morphology of the particles changed from cauliflower-like and dendritic to coral-like and spongy-like ones with increasing Ni2+/Co2+ ratio from 0.25 to 4.0. XRD analysis of the Ni-Co powders revealed that the decrease of Ni2+/Co2+ ratios(the increase of Co content) caused a change of structure from face centered cubic(FCC) obtained for the ratios of 4.0, 1.5 and 0.67 to a mixture of FCC and hexagonal closed-packed(HCP) phases for the ratio of 0.25. The increasing content of nickel led to change of mechanism of electrolysis from irregular(up to 40 wt.% Ni in the electrolytes) to close to equilibrium(between 40 and 60 wt.% Ni in the electrolytes) and anomalous co-deposition(over 60 wt.% Ni in the electrolytes) type. All of the obtained Ni-Co alloy samples behaved as soft magnetic materials while their magnetic parameters showed immediate composition dependence since both coercivity and saturation magnetization almost linearly increased with increase of the Co content.

关键词： Ni-Co alloy powders electrolysis hydrogen morphology magnetic properties

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