Nanocrystalline perovskite-like oxides formation in Ln$_{2}$O$_{3}$ -- Fe$_{2}$O$_{3}$ -- H$_{2}$O (Ln = La, Gd) systems

E. A. Tugova ; O. N. Karpov

Nanosistemy: fizika, himiâ, matematika, Tome 5 (2014) no. 6, pp. 854-860.

Résumé

Nanocrystalline LnFeO$_{3}$ (Ln = La, Gd) ferrites have been prepared by the co-precipitation method followed by heat treatment in air. The formation mechanisms for LaFeO$_{3}$ and GdFeO$_{3}$ in Ln$_{2}$O$_{3}$ – Fe$_{2}$O$_{3}$ – H$_{2}$O (Ln = La, Gd) systems under the mentioned conditions are investigated. The phase interaction scheme, reflecting ways which lead to the target, synthesis product yield, as well as the common tendency of LaFeO$_{3}$ and GdFeO$_{3}$ formation mechanisms, are constructed. The mean sizes of coherent scattering regions of LaFeO$_{3}$ and GdFeO$_{3}$ were determined to be 30 $\pm$ 3 and 40 $\pm$ 4 nm, respectively.

Détail

Mots-clés : LnFeO$_{3}$, ferrites, nanostructures, precipitation technique, phase formation, X-Ray diffraction.