Počet záznamů: 1
Sonochemical Synthesis of Amorphous Yttrium Iron Oxides Embedded in Acetate Matrix and their Controlled Thermal Crystallization toward Garnet (Y3Fe5O12) and Perovskite (YFeO3) Nanostructures
0350463 - UACH-T 2011 RIV US eng J - Článek v odborném periodiku
Pinkas, J. - Reichlová, V. - Serafimidisová, A. - Moravec, Z. - Zbořil, R. - Jančík, D. - Bezdička, Petr
Sonochemical Synthesis of Amorphous Yttrium Iron Oxides Embedded in Acetate Matrix and their Controlled Thermal Crystallization toward Garnet (Y3Fe5O12) and Perovskite (YFeO3) Nanostructures.
Journal of Physical Chemistry C. Roč. 114, č. 32 (2010), s. 13557-13564 ISSN 1932-7447
Výzkumný záměr: CEZ:AV0Z40320502
Klíčová slova: sol-gel method * magnetic-properties * iron(III) oxide
Kód oboru RIV: CA - Anorganická chemie
Impakt faktor: 4.520, rok: 2010
Sonolysis of stoichiometric mixtures of tris(2,4-pentanedionato)iron, Fe(acac)(3), and tris(2,4-pentanedionato)yttrium, Y(acac)(3)(H2O)(3), under Ar atmosphere in tetraglyme led to a colloidal solution from which amorphous Y-Fe-O nanopowders could be precipitated by hexane. These powders are composed of amorphous nanoparticles (3 nm) of yttrium iron(III) oxide embedded in an acetate matrix as proved by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), mass spectrometry, and Mossbauer and IR spectroscopy. The increasing amount (0, 2, 6%) of added water in the reaction mixture was found to lower the organics content in the sonochemical products. The thermally induced crystallization of the amorphous Y-Fe-O nanoparticles was studied by thermal analysis (TG/DSC), evolved gas analysis (EGA), high-temperature XRD, and Mossbauer spectroscopy.
Trvalý link: http://hdl.handle.net/11104/0190465