Abstract
The sintering of LaFeO3 has been studied in the temperature interval 1100–1600°C in air. The effect of cation nonstoichiometry on densification, microstructure, and phase composition is emphasized. La2O3 was observed to inhibit both sintering and grain growth. In Fe‐excess materials, exaggerated grain growth occurred, particularly above 1430°C, where a liquid phase was formed. Postsintering swelling was observed in Fe‐excess materials above 1430°C. The swelling mechanism is related to phase equilibria, which are reductive in nature and lead to the evolution of oxygen gas. The density in La‐excess materials remains high up to 1600°C, but the ceramics might disintegrate in air.
Published Version
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