High-Temperature Synthesis and Dielectric Properties of LaTaON.

The development of new synthetic methodologies of perovskite oxynitrides is challenging but necessary for the search of new compounds and the investigation of new properties. Here, we report a new method of preparation of the perovskite LaTaON that has been investigated as a pigment and photocatalyst for water splitting. The synthesis proceeds through the solid-state reactions under N at 1500 °C between LaO, LaN, and TaN or between LaN and TaON, which are completed after 3 h and lead to sintered, highly crystalline samples with particle sizes up to 1 μm.