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

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Authors

PINKAS Jiří REICHLOVÁ Vendula SERAFIMIDISOVÁ Aneta MORAVEC Zdeněk ZBOŘIL Radek JANČÍK Dalibor BEZDIČKA Petr

Year of publication 2010
Type Article in Periodical
Magazine / Source JOURNAL OF PHYSICAL CHEMISTRY C
MU Faculty or unit

Faculty of Science

Citation
Field Inorganic chemistry
Keywords Sonochemistry; Nanoparticles; Amorphous; Yttrium Iron Oxide; Garnet; Perovskite
Description 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 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. Depending on the Y/Fe starting stoichiometric ratio in the sonicated reaction mixture, the single-phase YFeO3 (YIP) with the perovskite structure or Y3Fe5O12 (YIG) with the garnet structure can be synthesized by such controlled thermal transformation.
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