Název:
Magnetic properties of doped CeO.sub.2./sub. nanoparticles and CeO.sub.2./sub.-Fe.sub.2./sub.O.sub.3./sub. mixed oxides
Autoři:
Mantlíková, Alice ; Bittová, Barbara ; Burianová, Simona ; Vejpravová, Jana ; Nižňanský, D. ; Holec, Petr Typ dokumentu: Příspěvky z konference Konference/Akce: Annual Conference of Doctoral Students - WDS 2012 /21./, Praha (CZ), 2012-05-29 / 2012-06-01
Rok:
2012
Jazyk:
eng
Abstrakt: We have investigated magnetic properties of CeO2 nanoparticles and CeO2/SiO2 nanocomposites doped by various magnetic metal oxide ions (Fe, Gd, Sm, Nd). Samples were obtained by co-precipitation and sol-gel method. Particle size has been obtained as 5 - 25 nm for nanocomposite and 25 - 100 nm for nanoparticles increasing with the increase of the annealing temperature. Detailed measurements of magnetization demonstrate paramagnetic state in the majority of the doped samples with maximum magnetization decreasing with the decrease of effective magnetic moment of the dopant ions from Gd3+ to Nd3+. It has been also observed, that the high-coercivity ε-Fe2O3 forms in CeO2-Fe2O3/SiO2 nanocomposite for higher concentration of the Fe ions (Ce/Fe/Si ratio equal to 1/2/9) and for the highest annealing temperature.
Klíčová slova:
CeO.sub.2./sub.; mixed oxides; nanoparticles; ε-Fe.sub.2./sub.O.sub.3./sub. Číslo projektu: CEZ:AV0Z10100521 (CEP), CEZ:AV0Z40320502 (CEP), GAP108/10/1250 (CEP) Poskytovatel projektu: GA ČR Zdrojový dokument: WDS´12 - Proceedings of Contributed Papers, Part III, ISBN 978-80-7378-226-9
Instituce: Fyzikální ústav AV ČR
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Informace o dostupnosti dokumentu:
Dokument je dostupný v příslušném ústavu Akademie věd ČR. Původní záznam: http://hdl.handle.net/11104/0218274