PHOTOACOUSTIC STUDY OF SOME FERROELECTRIC CERAMICS AND RELATED MATERIALS

Photoacoustic techniques including photoacoustic comprehensive measure ment meter, photoacoustic spectroscope and electron acoustic microscop e were used to study the photoacoustic effect of piezoelectric ZnO thi n films and the piezoelectric coefficients (e(33), e(31)), the phase t ransition in ferroelectric ceramics, PSZT and semiconductor BaTO3 cera mics, spatial distributions of polarization in PSZT ceramics, direct o bservation of domain structures of BaTiO3 ceramics, surface and subsur face texture of diamond film, residual stress distribution of sodium g lass and polycrystalline aluminum. The results show that the photoacou stic techniques have their own advantages over the existed methods. Th e experimental set-up and the generation mechanism of the acoustic sig nal were also described in the paper.