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Abstract:
Nanosized yttrium orthoferrite was obtained by the heat treatment of an
X-ray amorphous precursor prepared by the glycine-nitrate combustion
process in orthorhombic and hexagonal phases with average crystallite
sizes of 27-33 nm and 6-11 nm, respectively. The processes controlling
YFeO3 formation under the specified conditions were shown to be the
decomposition of yttrium carbonate and yttrium oxycarbonate. The
transition from the metastable hexagonal phase to the stable
orthorhombic phase in YFeO3 was shown to occur when the hexagonal YFeO3
crystallites reach sizes of 15 +/- 5 nm. The YFeO3 nanoparticle size
distribution was analyzed to suggest a phase transition scheme.
