Influence of Material Texture and Ionic Substitutions in Piezoceramics on the Resonance Frequency Dispersion Diagrams of Narrow-Strip Elements. Application to Multielement Ultrasonic Transducers

An analysis of the influence of second order mate- rial differentiations on the resonance frequency dispersion diagrams of narrow-strip piezoceramic elements has been made. Some types of lead zircono- titanate piezoceramics and some types of modified lead titanate piezoceramics were considered with textures corresponding to natural sintering or to under-load hot-pressing and with weak or strong simultaneous ionic substitutions. The analysis turns on the comparison of the tensorial characteristics and/or the comparison between effective parameters derived from the resonance frequency dispersion diagrams. Considering high frequency applications, a 10 MHz linear array made from an under-load hot- pressed piezoceramic is described.