PbTiO3PbZrO3In(Li35W25)O3 piezoelectric ceramics for surface wave filters

Abstract Piezoelectric ceramics with a low-temperature coefficient of surface wave velocity have been obtained in the ternary system PbTiO 3  PbZrO 3  In ( Li 3 5 W 2 5 ) O 3 with a small amount of MnO. The surface wave velocity temperature coefficient of the typical compound is 18 ppm/deg from −30° to 20°C and −3 ppm/deg between 20° and 80°C. Surface wave velocity is 2273 m/sec and propagation loss is 0.04 ∼ 0.05 db/ λ at about 22 MHz. Surface wave properties in this ternary system are suitable for surface wave devices, such as TV-PIF filters.