Effect of temperature on the structural properties of barium titanate nanopowders synthesis via sol-gel process

摘要

Sol-gel processed barium titanate (BaTiO3) ceramic has been characterized by X-ray diffraction (XRD) and Fourier Transformation Infrared (FT-IR) techniques. The results confirm that BaTiO(3 )crystallizes in the perovskite structure with Ba2TiO4 pyrochlore phase when calcined at relatively low temperature (800 degrees C) for 3h. Furthermore, XRD reveals the formation of a single-phase perovskite BaTiO3 without presence of secondary phases when calcined at the temperature of 900 and 1000 degrees C with the following lattice parameters: a = 3.9978 angstrom, c = 4.0197 angstrom and a = 3.9967 angstrom, c = 4.0220 angstrom respectively. the calcination temperature is confirmed to has a large influence in BaTiO3 structure, several parameters including, the tetragonality, volume (V) and crystallite size were found to be increased with increasing calcination temperature.