STUDY OF PIEZOELECTRIC CERAMIC MATERIALS FOR HIGH-TEMPERATURE AND HIGH-FREQUENCY APPLICATIONS

In this paper, some methods to get piezoelectric ceramic materials for high-temperature and high-frequency applications based on modified Pb TiO3 piezoelectric ceramics have been introduced. A solid solution sys tem (1 - X) PbTiO3 + XPb(Cd1/3Nb2/3)O-3 has been studied for its piezo electric properties as the B-position complex substitution of ABO(3) p erovskite structure. The system with X = 14 mol% has good piezoelectri c properties by adding some suitably modified additives, such as WO3, MnO2 and NiO. The Curie temperature is over 450 degrees C and the diel ectric constant, epsilon(s), is about 200 at room temperature. The pie zoelectric coupling factor k(t) is 0.45 and the mechanical quality fac tor Q(m) can be changed from 500 to 2400 according to different situat ions. The high stability of these materials makes it possible for them to be used in high-temperature and high-frequency situations. (C) 199 8 Elsevier Science S.A. All rights reserved.