Study of Dielectric and Piezoelectric Properties in the Ternary System Pb_0.98Ca_0.02[{(Zr_0.52Ti_0.48)_0.98(Cr³⁺_0.5 , Ta⁵⁺_0.5)_0.02}_1–zP_z]O₃ Doping Effects

Abstract

The effects of P 2 O5 oxide on microstructure, dielectric and piezoelectric properties of Pb 0.98 Ca 0.02 [{(Zr 0.52 Ti 0.48 ) 0.98 ( Cr 3+ 1/2 ,Ta 5+ 1/2 ) 0.02 } 1–z P z ]O 3 ternary ceramics were investigated. Specimens with various contents of P 2 O 5 from 0 to 12 wt. % were prepared by a conventional oxide mixing technique. The effect of P 2 O 5 doping with regard to the development of the crystalline phase, density, microstructure, dielectric, ferroelectric and piezoelectric characteristics has been investigated. It has been found that the sintering temperature of piezoelectric Pb 0.98 Ca 0.02 [{(Zr 0.52 Ti 0.48 ) 0.98 (Cr 3+ 1/2 ,Ta 5+ 1/2 ) 0.02 } 1–z P z ]O 3 can be reduced by phosphorus addition without compromising the dielectric properties. A sintered density of 94 % of the theoretical density was obtained for 4 wt. % P 2 O 5 addition after sintering at 1050°C for 4 h. Ceramics sintered at 1050°C with 4 wt. % P 2 O 5 achieve excellent properties, which are as follows: kp = 0.73, ρ = 0.09 × 10 +4 (Ω. cm), εr = 18800, tanδ = 0.0094 and Tc = 390°C.