Phase transition on ferroelectric ceramics were detected by photoacoustic l
aser technique which allows the measurement of the Curie temperature and fe
rro-paraelectric transitions. The photoacoustic signal produced by low ener
gy laser pulses using a piezoelectric transducer attached to the sample by
a glass or quartz rod is shown. The developed technique requires nor signal
amplification neither special preparation of the sample and have an excell
ent signal to noise ratio. Ln order to validate this technique it was appli
ed to the measurement of Curie temperature of the PbSmTiO3 and Pb(MgNb)TiO3
ceramics. These results were compared with those obtained by DTA, DMA and
dielectric permittivity.