Hydrothermal synthesis and characterization of La2M2O7 (M = Ti, Zr) powders

Abstract La 2 M 2 O 7 (M = Ti, Zr) powders have been hydrothermally synthesized from the double hydrous oxides La 2 O 3 2MO 2 nH 2 O using KOH as the mineralizer. The effects of factors such as the KOH concentration, reaction temperature, and time were investigated. Moreover, the related phases perovskite La 2/3 TiO 3−λ (λ = 0.000–0.024) and fluorite La 2 Zr 2 O 7 as well as pyrochlore La 2 Zr 2 O 7 powders were prepared for the first time by the hydrothermal method. Further insight was gained through X-ray diffraction, transmission electron microscopy, infrared, and other techniques. The moderate conditions give excellent ceramics powders, and the resulting particles, with a simple mode of size distribution, appear at low agglomeration.