Abstract
Dielectric, pyroelectric and piezoelectric properties of relaxor ferroelectric in the 0.4Pb(Mg1/3Nbm)O3-(0.6-x)Pb(Mg1/3Ta2/3)O3-xPbTiO3 solid solution series have been investigated. The dielectric constant and loss of poled ceramic samples were determined. The pyroelectric coefficient and the spontaneous polarization were measured by the static Byer-Roundy method as a function of temperature. The electromechanical coupling factor(kp) and piezoelectric d33 were measured by using the resonanceantiresonance method and Berlincourt d33 meter, respectively. The transition temperature is continuously shifted to higher temperature with increase of a small amount of PbTiO3. The composition with the maximum piezoelectric constant exhibits the high dielectric and pyroelectric constant
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