The Effect of lanthanum Substitution on the Ferroelectric and Piezoelectric Properties of (Pb۰.۸۸Sr۰.۱۲)(Zr۰.۵۴Ti۰.۴۴Sb۰.۰۲)O۳ Ceramics

Piezoelectric ceramics based on lead zirconate titanate (PZT) with a composition of (Pb۰.۸۸-۳x/۲Sr۰.۱۲Lax)(Zr۰.۵۴Ti۰.۴۴Sb۰.۰۲)O۳ where x=۰.۰, ۰.۰۰۵ and ۰.۰۱ were synthesized using conventional solid state sintering at ۱۲۸۰°C. The effect of lanthanum substitution on the microstructure, ferroelectric and piezoelectric properties of the samples was studied. The results showed that lanthanum substitution was beneficial for densification of the samples during sintering and the samples with ۱.۰ mole% lanthanum exhibited the maximum density of ۷.۳۴ g.cm-۳ when sintered at ۱۲۸۰°C. Moreover, the piezoelectric coefficient (d۳۳), relative dielectric constant (er), dielectric loss (tanδ), electromechanical coupling coefficient (kp) and the Curie temperature (TC) of the samples reached the optimal values of ۶۳۵ pC/N, ۳۰۰۰, ۰.۰۱۸, ۰.۶۷ and ۱۹۵°C respectively at ۰.۵ mole% lanthanum substitution. Furthermore, the bulk density (ρ) was ۷.۳۱ g.cm-۳ for the same sample. The results indicate that the lanthanum doped PSZTS ceramics can be hopefully used in applications such as pulsed transmitting transducers, high sensitivity receivers and actuators with large displacements.

کلیدواژه ها:

PSZTS ، Lanthanum additive ، ferroelectric and piezoelectric properties