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Synthesis of nano-crystalline NiFe2O4 powders in subcritical and supercritical ethanol
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SYSNO ASEP 0463861 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Synthesis of nano-crystalline NiFe2O4 powders in subcritical and supercritical ethanol Author(s) Ćosović, A. (RS)
Žák, Tomáš (UFM-A) RID
Glisić, S. (RS)
Sokić, M. (RS)
Lazarević, S. (RS)
Ćosović, V. (RS)
Orlović, A. (RS)Number of authors 7 Source Title Journal of Supercritical Fluids. - : Elsevier - ISSN 0896-8446
Roč. 113, JUL (2016), s. 96-105Number of pages 10 s. Language eng - English Country NL - Netherlands Keywords supercritical ; subcritical ; nano-crystalline powders ; nickel ferrite ; metal oxide ; magnetic properties Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects ED1.1.00/02.0068 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFM-A - RVO:68081723 UT WOS 000375500000014 EID SCOPUS 84961926591 DOI https://doi.org/10.1016/j.supflu.2016.03.014 Annotation Nano-crystalline nickel ferrite has a broad range of applications due to its favourable magnetic properties. Those characteristics can be significantly influenced by the synthesis pathway including methods conducted in the presence of supercritical alcohols. Nano-crystalline NiFe2O4 powders were obtained in the reaction under subcritical and supercritical conditions of ethanol. Both high pressure synthesis routes resulted in powders with smaller primary particles and higher mesoporosity than co-precipitation method. Upon the annealing treatment the average crystallite size increased while material structure remained uniform, resulting in significantly enhanced magnetic properties, such as coercivity and remanence. It was found that synthesis under supercritical conditions provides higher conversion but also material with larger average crystallite size upon annealing. The time and temperature of annealing stage significantly influenced the morphology and magnetic properties of the obtained powders. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2017
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