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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F12%3A10127296%21RIV13-GA0-11310___
rdf:type
skos:Concept n7:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1016/j.jssc.2012.03.022
dcterms: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.
dcterms: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
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
skos:notation
RIV/00216208:11310/12:10127296!RIV13-GA0-11310___
n7:predkladatel
n8:orjk%3A11310
n3:aktivita
n22:I n22:S n22:P n22:Z
n3:aktivity
I, P(GAP108/10/1250), S, Z(AV0Z10100521), Z(MSM0021620857)
n3:cisloPeriodika
7
n3:dodaniDat
n4:2013
n3:domaciTvurceVysledku
n20:5646057
n3:druhVysledku
n21:J
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
170850
n3:idVysledku
RIV/00216208:11310/12:10127296
n3:jazykVysledku
n17:eng
n3:klicovaSlova
phase transitions; iron oxide polymorphs; high coercivity; epsilon-Fe2O3; CeO2
n3:klicoveSlovo
n9:epsilon-Fe2O3 n9:high%20coercivity n9:CeO2 n9:iron%20oxide%20polymorphs n9:phase%20transitions
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[5C39C5E381A2]
n3:nazevZdroje
Journal of Solid State Chemistry
n3:obor
n6:BM
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
7
n3:projekt
n10:GAP108%2F10%2F1250
n3:rokUplatneniVysledku
n4:2012
n3:svazekPeriodika
191
n3:tvurceVysledku
Nižňanský, Daniel Ardu, Andrea Bittová, Barbara Burianová, Simona Cannas, Carla Mantlíková, Alice Poltierová Vejpravová, Jana
n3:wos
000305670700020
n3:zamer
n16:MSM0021620857 n16:AV0Z10100521
s:issn
0022-4596
s:numberOfPages
6
n19:doi
10.1016/j.jssc.2012.03.022
n15:organizacniJednotka
11310