The Effect of lanthanum Substitution on the Ferroelectric and Piezoelectric Properties of (Pb0.88Sr0.12)(Zr0.54Ti0.44Sb0.02)O3 Ceramics

Goudarzi, H.; Baghshahi, Saeid; Tabarzadi, R.

doi:10.22068/ijmse.4465

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‎ 10.22068/ijmse.4465

The Effect of lanthanum Substitution on the Ferroelectric and Piezoelectric Properties of (Pb0.88Sr0.12)(Zr0.54Ti0.44Sb0.02)O3 Ceramics

H. Goudarzi

, Saeid Baghshahi

, R. Tabarzadi

Abstract: (157 Views)

Piezoelectric ceramics based on lead zirconate titanate (PZT) with a composition of (Pb_0.88-3x/2Sr_0.12La_x)(Zr_0.54Ti_0.44Sb_0.02)O₃ where x=0.0, 0.005 and 0.01 were synthesized using conventional solid state sintering at 1280°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 1.0 mole% lanthanum exhibited the maximum density of 7.34 g.cm^-3 when sintered at 1280°C. Moreover, the piezoelectric coefficient (d₃₃), relative dielectric constant (e_r), dielectric loss (tanδ), electromechanical coupling coefficient (k_p) and the Curie temperature (T_C) of the samples reached the optimal values of 635 pC/N, 3000, 0.018, 0.67 and 195°C respectively at 0.5 mole% lanthanum substitution. Furthermore, the bulk density (ρ) was 7.31 g.cm^-3 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.

Keywords: PSZTS, Lanthanum additive, ferroelectric and piezoelectric properties