Sonochemical Synthesis of Amorphous Yttrium Iron Oxides Embedded in Acetate Matrix and their Controlled Thermal Crystallization toward Garnet (Y3Fe5O12) and Perovskite (YFeO3) Nanostructures

0350463 - ÚACH 2011 RIV US eng J - Journal Article
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. E-ISSN 1932-7455
Institutional research plan: CEZ:AV0Z40320502
Keywords : sol-gel method * magnetic-properties * iron(III) oxide
Subject RIV: CA - Inorganic Chemistry
Impact factor: 4.520, year: 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.
Permanent Link: http://hdl.handle.net/11104/0190465