Effect of PMS modification on dielectric and piezoelectric properties in xPMS-(1-x)PZT ceramics

The structural, dielectric and piezoelectric properties of xPMS-(] - x)PZT ceramics were investigated as a function of Pb(Mn1/3Sb2/3)O-3 (PMS) content by x-ray diffraction, scanning electron microscopy, and dielectric and piezoelectric spectroscopy techniques. All the Pb(Mn1/3Sb2/3))(3)-PbZrO3-PbTiO3 (PMS-PZT) samples exhibit a single phase of perovskite structure with tetragonal symmetry. Dielectric studies revealed that the phase transition temperature (T-c) is suppressed with increasing PMS content. For PMS-PZT samples with 0.08 <= x <= 0.15, the maximum dielectric constant decreases as the measurement frequencies increase and the permittivity maximum temperature (T-m) is shifted towards higher temperatures as well, which indicates that dielectric relaxor behaviour was observed, while for x = 0.02 and 0.05, there is no shift in T-m which implies normal ferroelectric behaviour. The samples with a composition of x = 0.05 exhibit excellent dielectric and piezoelectric properties (epsilon(r) = 1540, d(33) = 360 pC N-1, K-p = 0.58, tan delta = 0.45%, Q(m), = 12 10) and, therefore, should be ideal candidates for high-power applications, such as in piezoelectric transformers.