About: Stabilization of the high coercivity epsilon-Fe2O3 phase in the CeO2-Fe2O3/SiO2 nanocomposites

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About: Stabilization of the high coercivity epsilon-Fe2O3 phase in the CeO2-Fe2O3/SiO2 nanocomposites Goto Sponge Distinct Permalink

An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://dx.doi.org/10.1016/j.jssc.2012.03.022
Description	We have investigated the processes leading to the formation of the Fe2O3 and CeO2 nanoparticles in the SiO2 matrix in order to stabilize the epsilon-Fe2O3 as the major phase. The samples with two different concentrations of the Fe were prepared by sol-gel method, subsequently annealed at different temperatures up to 1100 degrees C, and characterized by the Mossbauer spectroscopy, Transmission Electron Microscopy (TEM), Powder X-ray Diffraction (PXRD), Energy Dispersive X-ray analysis (EDX) and magnetic measurements. The evolution of the different Fe2O3 phases under various conditions of preparation was investigated, starting with the preferential appearance of the gamma-Fe2O3 phase for the sample with low Fe concentration and low annealing temperature and stabilization of the major epsilon-Fe2O3 phase for high Fe concentration and high annealing temperature, coexisting with the most stable alpha-Fe2O3 a phase. A continuous increase of the particle size of the CeO2 nanocrystals with increasing annealing temperature was also observed. We have investigated the processes leading to the formation of the Fe2O3 and CeO2 nanoparticles in the SiO2 matrix in order to stabilize the epsilon-Fe2O3 as the major phase. The samples with two different concentrations of the Fe were prepared by sol-gel method, subsequently annealed at different temperatures up to 1100 degrees C, and characterized by the Mossbauer spectroscopy, Transmission Electron Microscopy (TEM), Powder X-ray Diffraction (PXRD), Energy Dispersive X-ray analysis (EDX) and magnetic measurements. The evolution of the different Fe2O3 phases under various conditions of preparation was investigated, starting with the preferential appearance of the gamma-Fe2O3 phase for the sample with low Fe concentration and low annealing temperature and stabilization of the major epsilon-Fe2O3 phase for high Fe concentration and high annealing temperature, coexisting with the most stable alpha-Fe2O3 a phase. A continuous increase of the particle size of the CeO2 nanocrystals with increasing annealing temperature was also observed. (en)
Title	Stabilization of the high coercivity epsilon-Fe2O3 phase in the CeO2-Fe2O3/SiO2 nanocomposites Stabilization of the high coercivity epsilon-Fe2O3 phase in the CeO2-Fe2O3/SiO2 nanocomposites (en)
skos:prefLabel	Stabilization of the high coercivity epsilon-Fe2O3 phase in the CeO2-Fe2O3/SiO2 nanocomposites Stabilization of the high coercivity epsilon-Fe2O3 phase in the CeO2-Fe2O3/SiO2 nanocomposites (en)
skos:notation	RIV/00216208:11310/12:10127296!RIV13-GA0-11310___
http://linked.open...avai/riv/aktivita	I P S Z
http://linked.open...avai/riv/aktivity	I, P(GAP108/10/1250), S, Z(AV0Z10100521), Z(MSM0021620857)
http://linked.open...iv/cisloPeriodika	7
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Nižňanský, Daniel
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	170850
http://linked.open...ai/riv/idVysledku	RIV/00216208:11310/12:10127296
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	phase transitions; iron oxide polymorphs; high coercivity; epsilon-Fe2O3; CeO2 (en)
http://linked.open.../riv/klicoveSlovo	epsilon-Fe2O3 phase transitions high coercivity CeO2 iron oxide polymorphs
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[5C39C5E381A2]
http://linked.open...i/riv/nazevZdroje	Journal of Solid State Chemistry
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	7 (xsd:int)
http://linked.open...vavai/riv/projekt	Multifunctional nanoparticles: smart preparation methods and study of their physical properties
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	191
http://linked.open...iv/tvurceVysledku	Nižňanský, Daniel Poltierová Vejpravová, Jana Bittová, Barbara Burianová, Simona Mantlíková, Alice Ardu, Andrea Cannas, Carla
http://linked.open...ain/vavai/riv/wos	000305670700020
http://linked.open...n/vavai/riv/zamer	Physics and technology of nanostructures, surfaces and thin films Nové molekulární systémy pro pokročilé aplikace prospěšné pro zdraví a šetrné k životnímu prostředí
issn	0022-4596
number of pages	6 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.jssc.2012.03.022
http://localhost/t...ganizacniJednotka	11310

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