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

  1. 1.
    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