ELECTRICAL AND ELECTROMECHANICAL PROPERTIES OF HOT-PRESSED PB(FE1/2NB1/2)O3 FERROELECTRIC CERAMICS

Dense ceramics of Pb(Fel/2Nb1/2)O3 with high resistivity were fabricated below 1000-degrees-C by making use of the hot-pressing technique. For these hot-pressed specimens, measurements of the spontaneous polarization, dielectric constants, electromechanical coupling factors, piezoelectric constants and elastic compliance constants were carried out as a function of temperatures between -30-degrees-C and 200-degrees-C. Temperature variations of the resistivity and linear thermal expansion were also studied. At room temperature, the following values were obtained epsilon33T/epsilon0 = 2640, P(s) = 11.3 muC/cm2, k33 = 0.266, d33 = 145 X 10(-12) C/N and s33E = 12.3 x 1O(-12) m2/N. These values were briefly compared with those of BaTiO3 ceramics.