Abstract
The synthesis of perovskite-type LaCrO3 under mild hydrothermal conditions is reported. The synthesized product was characterized by means of XRD, IR, SEM and elemental analysis. The results indicated that the phase corresponded to orthorhombic perovskite-type LaCrO3, and the product had a narrow particle size distribution in the range of 1–3 µm. The effect of hydrothermal conditions on the synthesis of LaCrO3 was investigated. Under the hydrothermal conditions used, the optimum crystallization temperature was 240–260 °C. For the formation of pure LaCrO3, a higher alkalinity (≥ 8 mol dm–3 KOH) is necessary because Cr3+ is significantly amphoteric. In the reactant mixing process, the optimum stirring time is 5–10 min because of the oxidation of CrO2– ion by oxygen in the air. CrO42– does not show significant hydrothermal reactivity under the present conditions.
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