Abstract
Piezoelectric and optical properties were measured for PLZT with composition of X/65/35. Rapid increase of piezoelectric constants in PLZT above 8mol% substitution of La led to a decrease of optical transmittance. The composition in which transmittance coexists with piezoelectricity was 8.1/65/35. A transparent loudspeaker using the PLZT(8.1/65/35) showed a sound pressure of 70dB and a transmittance of 65% .
