Preparation of Pb1−xLaxTi1−x/4O3 (x=0.28) powders by a sol–gel-hydrothermal method

Pseudocubic Pb1−xLaxTi1−x/4O3 (PLT, x=0.28) powders were prepared by a sol–gel-hydrothermal method using KOH as mineralizer. Characterization via X-ray diffraction and Raman spectroscopy indicate that, KOH mineralizer plays two important roles in this work. First, it favors the crystallization of PLT; second, it promotes La to be solved in the lattice which consequently resulted in the phase transition from tetragonal structure to pseudocubic structure.