Magnetic properties of doped CeO.sub.2./sub. nanoparticles and CeO.sub.2./sub.-Fe.sub.2./sub.O.sub.3./sub. mixed oxides

0389410 - FZÚ 2013 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Mantlíková, Alice - Bittová, Barbara - Burianová, Simona - Vejpravová, Jana - Nižňanský, D. - Holec, Petr
Magnetic properties of doped CeO₂ nanoparticles and CeO₂-Fe₂O₃ mixed oxides.
WDS´12 - Proceedings of Contributed Papers, Part III. Praha: Matfyzpress, 2012 - (Šafránková, J.; Pavlů, J.), s. 12-17. ISBN 978-80-7378-226-9.
[Annual Conference of Doctoral Students - WDS 2012 /21./. Praha (CZ), 29.05.2012-01.06.2012]
Grant CEP: GA ČR GAP108/10/1250
Výzkumný záměr: CEZ:AV0Z10100521; CEZ:AV0Z40320502
Klíčová slova: CeO₂ * ε-Fe₂O₃ * mixed oxides * nanoparticles
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

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.
Trvalý link: http://hdl.handle.net/11104/0218274