Phase Structure of Nanocrystalline BaTiO<sub>3</sub> Powders via One-Step Solvothermal Route

Abstract

5 nm BaTiO3 powder has been successfully prepared by the one-step solvothermal method. The different grain size BaTiO3 powders have been achieved after calcining the 5 nm Nanocrystalline BaTiO3 powders at 700°C, 850°C and 950°C for 3 h. In-situ heating Raman spectroscopy revealed the dispersive phase transition character in the nanocrystalline BaTiO3 powders. As the BaTiO3 grain size decreases, wider phase transition temperature and the Raman intensity becomes weak. The BaTiO3 powders of the 5 nm nanocrystalline exhibited the similar phase transformations from rhombohedral to orthorhombic to tetragonal to cubic transitions as those in the coarse BaTiO3 ceramics.