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Chemical synthesis of nickel ferrite spinel designed as an insulating bilayer coating on ferromagnetic particles
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SYSNO ASEP 0450321 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Chemical synthesis of nickel ferrite spinel designed as an insulating bilayer coating on ferromagnetic particles Author(s) Strečková, M. (SK)
Hadraba, Hynek (UFM-A) RID, ORCID
Bureš, R. (SK)
Fáberová, M. (SK)
Roupcová, Pavla (UFM-A) RID, ORCID
Kuběna, Ivo (UFM-A) RID, ORCID
Medvecký, L. (SK)
Girman, V. (SK)
Kollár, P. (SK)
Füzer, J. (SK)
Čižmár, E. (SK)Number of authors 11 Source Title Surface and Coatings Technology. - : Elsevier - ISSN 0257-8972
Roč. 270, MAY (2015), s. 66-76Number of pages 11 s. Language eng - English Country CH - Switzerland Keywords soft magnetic composite ; NiFe2O4 spinel ferrite ; coating ; precipitation method ; focused ion beam Subject RIV JG - Metallurgy R&D Projects GA14-25246S GA ČR - Czech Science Foundation (CSF) ED1.1.00/02.0068 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFM-A - RVO:68081723 UT WOS 000354149400009 EID SCOPUS 84927175734 DOI 10.1016/j.surfcoat.2015.02.054 Annotation Soft magnetic core–shell particles were designed by coating FeSi and permalloy powders with ferrite nanoparticles. The permalloy-type powder particles were prepared by mechanical alloying process of 80 wt% of Ni, 14.7 wt% of Fe, 4.4 wt% of Mo, 0.5 wt% of Mn and 0.3 wt% Si. NiFe2O4 cuboidal nanoparticles were synthesized by the chemical precipitation of hydroxides by alkaline treatment of the dissolved metal in aqueous chloride solution and the same process was used for a deposition of NiFe2O4 nanoparticles on both substrates. The average size of NiFe2O4 nanoparticles, crystallinity and spinel structure were determined by TEM and XRD techniques. The deposited coating was created in a bilayer form. The composition of individual layer was analyzed by XRD and TEM using 100-nm lamella extracted from the coating by focused ion beam. The chemical composition of individual layers was analyzed by EDX analysis. The specific electric resistivity measurement has confirmed a good insulating character of the designed bilayer coating, whereas the prepared core–shell powders and relevant green compacts belong to soft magnetic materials. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2016
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