Dielectric, pyroelectric and piezoelectric properties of 0.66Pb(Mg1/3Ta2/3)O-3-0.34PbTiO(3) solid solution modified with Cr2O3

The effects of Cr3+ substitution on dielectric, pyroelectric and piezoelect ric properties of 0.66Pb(Mg1/3Ta2/3)O-3-0.34PbTiO(3) (PMT-PT) ceramics have been investigated: The calcined and sintered specimens have been character ized using XRD for phase analysis. The dielectric constant and loss of the ceramic samples were determined. The pyroelectric coefficient was measured using the Byer-Roundy method as a function of temperature. Small amounts of Cr2O3 promoted grain growth of the solid solution system. Dielectric, pyro electric and piezoelectric properties of the base composition were improved with addition of small amounts of Cr2O3. The dielectric and pyroelectric p eak temperatures are continuously shifted to lower temperature with additio n of small amounts of Cr2O3. The frequency dispersion and the diffuseness o f phase transition increase as the amount of Cr2O3 in the composition incre ases.