Abstract
Perovskite-type oxides with submicron particle size were prepared by thermal decomposition of heteronuclear cyano complexes. Dehydration and decomposition of CN-bridged structure were performed by heating at ∼300 °C in air, generating vitreous phases containing carbonates. For the complexes comprising La, Pr, Nd and Sm, submicron-sized particles of perovskite-type oxide directly formed from a vitreous phase. Single phase of perovskite-type oxide was formed by heating at ∼600 °C of the complex with La. For the complexes comprising Gd, Dy and Ho, heat-treatment at ∼300 °C led to formation of a vitreous phase containing carbonate and no perovskite-type oxide. By increasing the calcining temperature, a mixture of single oxides (Fe2O3 and Ln2O3) and perovskite-type oxides was formed at lower temperatures and single-phase perovskite-type oxide at higher temperatures. The formation temperature of the perovskite-type oxide increased with decreasing lanthanoid ion radius.
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