Abstract
Structural properties of hydrothermally deposited PbTiO3 films have been investigated. The films were synthesized in the temperature range from 120 to 180 °C for 24 h. X-ray diffraction (XRD) analysis indicates that all of the deposited films exhibited the tetragonal perovskite single phase. However, 001 diffraction peaks broadened in comparison with 100 diffraction peaks. Structural characterization showed that the films had two regions with different crystallinities. In one region, the PbTiO3 crystals had a relatively high crystallinity and grew with a preferred orientation in the (001) direction. Furthermore, in this region, the crystallinity of the crystals deposited at a temperature as low as 120 °C was similar to that of the crystals deposited at 180 °C. On the other hand, the PbTiO3 crystals in another region exhibited a low crystallinity and a random orientation. Consequently, the broadening of the 001 diffraction peaks can be explained by the mixed structure of the two regions with different crystallinities.