Synthesis of LaMeO 3 (Me = Cr, Mn, Fe, Co) Perovskite Oxides from Aqueous Solutions

LaMeO 3 (Me = Cr, Mn, Fe, Co) perovskite oxides have many functional uses, and methods for forming films from aqueous solutions are advantageous compared with CVD, sputtering, sol‐gel methods, etc., because of lower cost, no requirement for a vacuum or high temperature, and applicability to films with wide areas and/or complicated shapes. A novel method for synthesizing LaMeO 3 from aqueous solutions at ordinary temperature and pressure has been discovered. LaMeO powder produced by solid‐state reaction was dissolved in hydrofluoric acid. Boric acid was added to shift the chemical equilibrium, then LaMeO 3 was synthesized. This method promises to lead to applications for preparing perovskite films for various uses.