About: Magnetic properties of TCr2O4 (T = Co, Ni) fine powders and TCr2O4/SiO2 nanocomposites

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About: Magnetic properties of TCr2O4 (T = Co, Ni) fine powders and TCr2O4/SiO2 nanocomposites Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	We have studied magnetic properties of TCr2O4 (T = Co, Ni) fine powders, obtained by the citric acid method, and TCr2O4/SiO2 nanocomposites, constituted of spinel nanoparticles embedded in silica matrix fabricated by a modified sol gel method. All samples were characterized by powder X-ray diffraction, scanning electron microscopy and microprobe analysis. The profile analysis of the powder X-ray diffraction revealed that the particle size is larger for the fine powder samples, as expected. Detailed measurements of magnetization, hysteresis loops and a.c. susceptibility demonstrate significant differences in magnetic properties of the fine powders in comparison to the nanocomposite samples. The values of the coercitivity at 10 K ranges from approximate to 2T for NiCr2O4 fine powders to approximate to 0.6 T for CoCr2O4/SiO2 nanocomposites. Moreover, the hysteresis loops of the NiCr2O4/SiO2 samples are brightly asymmetric. The phenomenon will be discussed in context of the exchange-bias originated by presence of a tiny amount of the antiferromagnetic phase, Cr2O3 in the samples. We have studied magnetic properties of TCr2O4 (T = Co, Ni) fine powders, obtained by the citric acid method, and TCr2O4/SiO2 nanocomposites, constituted of spinel nanoparticles embedded in silica matrix fabricated by a modified sol gel method. All samples were characterized by powder X-ray diffraction, scanning electron microscopy and microprobe analysis. The profile analysis of the powder X-ray diffraction revealed that the particle size is larger for the fine powder samples, as expected. Detailed measurements of magnetization, hysteresis loops and a.c. susceptibility demonstrate significant differences in magnetic properties of the fine powders in comparison to the nanocomposite samples. The values of the coercitivity at 10 K ranges from approximate to 2T for NiCr2O4 fine powders to approximate to 0.6 T for CoCr2O4/SiO2 nanocomposites. Moreover, the hysteresis loops of the NiCr2O4/SiO2 samples are brightly asymmetric. The phenomenon will be discussed in context of the exchange-bias originated by presence of a tiny amount of the antiferromagnetic phase, Cr2O3 in the samples. (en)
Title	Magnetic properties of TCr2O4 (T = Co, Ni) fine powders and TCr2O4/SiO2 nanocomposites Magnetic properties of TCr2O4 (T = Co, Ni) fine powders and TCr2O4/SiO2 nanocomposites (en)
skos:prefLabel	Magnetic properties of TCr2O4 (T = Co, Ni) fine powders and TCr2O4/SiO2 nanocomposites Magnetic properties of TCr2O4 (T = Co, Ni) fine powders and TCr2O4/SiO2 nanocomposites (en)
skos:notation	RIV/61388980:_____/11:00435626!RIV15-GA0-61388980
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(GAP108/10/1250)
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Holec, Petr Plocek, Jiří
http://linked.open.../riv/druhVysledku	D - Článek ve sborníku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav anorganické chemie AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	210227
http://linked.open...ai/riv/idVysledku	RIV/61388980:_____/11:00435626
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	NICR2O4; nanocomposites (en)
http://linked.open.../riv/klicoveSlovo	nanocomposites NICR2O4
http://linked.open...ontrolniKodProRIV	[14DDE6A35532]
http://linked.open...v/mistoKonaniAkce	Osaka
http://linked.open...i/riv/mistoVydani	Bristol
http://linked.open...i/riv/nazevZdroje	IOP conference series: Materials science and engineering
http://linked.open...in/vavai/riv/obor	CA
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Multifunctional nanoparticles: smart preparation methods and study of their physical properties
http://linked.open...UplatneniVysledku	2011
http://linked.open...iv/tvurceVysledku	Holec, Petr Nižňanský, D. Plocek, Jiří Mantlíková, A. Vejpravová, J. P.
http://linked.open...vavai/riv/typAkce	WRD - Světová
http://linked.open...ain/vavai/riv/wos	000299436300022
http://linked.open.../riv/zahajeniAkce	2010-11-14 (xsd:date)
issn	1757-8981
number of pages	4 (xsd:int)
http://bibframe.org/vocab/doi	10.1088/1757-899X/18/3/032022
http://purl.org/ne...btex#hasPublisher	IOP Publishing

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