Synthesis of Pb(Mg_1/3Nb_2/3)O3-PbTiO₃ film on Ti substrates by a single step at low temperature

The relaxor ferroelectric Pb(Mg(1/3)Nb(2/3))O"3PbTiO"3 compositions are of interest owing to their excellent dielectric, electromechanical, electro-optical, and other properties. In this paper, the 0.80Pb(Mg(1/3)Nb(2/3))O"30.20PbTiO"3 (PMNPT 80/20) films with pure perovskite structure were synthesized by a single step at 150°C. The corresponding oxides were used as starting materials, namely PbO, MgO, Nb"2O"5, and TiO"2. By using oxides as precursors, we simplified the hydrothermal process, allowing the process to be more economical. The influences of the Ti metal substrate on the PMNPT 80/20 films are investigated. By surveying the variations of films, it was suggested that the substrate reacted with the ions in the solution. The films were smooth and homogeneous. There were no cracks and abnormity crystals on the surface of the films. The thickness was about 20 μm. The frequencies dependence of the dielectric properties of PMNPT 80/20 films was stable even at a high frequency range over 1 MHz.