DIELECTRIC, PYROELECTRIC AND PIEZOELECTRIC PROPERTIES IN THE PB(MG1 3NB2/3)O-3-PB(MG1/3TA2/3)O-3-PBTIO3 SYSTEM/

Dielectric, pyroelectric and piezoelectric properties of relaxer ferro electric in the (Mg1/3Nb2/3)O-3-(0.6-x)Pb(Mg1/3Ta2/3)O-3-xPbTiO(3) sol id solution series have been investigated. The dielectric constant and loss of poled ceramic samples were determined. The pyroelectric coeff icient and the spontaneous polarization were measured by the static By er-Roundy method as a function of temperature. The electromechanical c oupling factor(k(p)) and piezoelectric d(33) were measured by using th e resonance-antiresonance method and Berlincourt d(33) meter, respecti vely. The transition temperature is continuously shifted to higher tem perature with increase of a small amount of PbTiO3. The composition wi th the maximum piezoelectric constant exhibits the high dielectric and pyroelectric constant.