Investigations On The Fabrication And Electrical Properties Of Perovskite Ferroelectric Nanocomposite Thin Film

Perovskite ferroelectric solid solutions, represented by(1-x)Pb(Mg1/3Nb2/3)O3-x Pb Ti O3(PMNT), has excellent piezoelectric and electromechanical coupling performance with the composition around the morphotropic phase boundary, which has important application prospect in sensors and transducers. However, this system has low Curie temperature and phase transition temperature, for example, the Curie temperature of PMNT with the composition around the morphotropic phase boundary is about 150 0C and the phase transition temperature is less than 1000 C, which limits its application microelectronic mechanical system and pyroelectric detector. It is the quite necessary to increase the Curie temperature and widen the temperature range. to the present work aims to fabricate vertically aligned nanocomposite thin films and broaden its temperature so as to promote its practical application.Using the traditional solid-state reaction method, the composite target PMNT-Mg O(with the mole ratio of 1:1) was fabricated, owning pure phase structure and high density. Furthermore, Sr Ru O3 was deposited on the Sr Ti O3 single crystal substrate as the bottom electrode. And then the PMNT-Mg O composite thin films were deposited on the Sr Ru O3/Sr Ti O3<001>、<110>、<111>single crystal substrate using PLD. the influence of the fabrication process on the crystal structures, surface microstructures and ferroelectric properties was systematically studied. Results indicated that the two phases of PMNT and Mg O owned pure phase, and the PMNT-Mg O composite thin films can be readily obtained on the Sr Ru O3/Sr Ti O3 single crystal substrate. The electric properties show that composite thin films have excellent ferroelectric properties and good temperature stability.