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Ferroelectric and piezoelectric properties of Ag modified PMN-PZT solid solutions

Published online by Cambridge University Press:  13 December 2006

R. Koduri  and
M. Lopez
R. Koduri*
Affiliation:
Departmento de Ingeneria de Materials, (DIMAT), Facultad de Ingenieria, Universidad de Concepcion, Edmundo Larenas 270, Casilla 160 C, Concepcion, Chile
M. Lopez
Affiliation:
Departmento de Ingeneria de Materials, (DIMAT), Facultad de Ingenieria, Universidad de Concepcion, Edmundo Larenas 270, Casilla 160 C, Concepcion, Chile
*
[email protected]
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Abstract

The ferroelectric and piezoelectric properties of Ag doped xPb(Mg1/3Nb2/3)O3-(1 − x) Pb(Zr0.532Ti0.468)O3 ceramics, for Ag = 0.5, 1 and 1.5 mole%, synthesized by the columbite precursor method were investigated. The experimental results indicate that stoichiometry plays a significant role in the solubility of Ag and it affects the physical properties. The factors influencing microstructural development of Ag doped PMN-PZT are the Ag and PMN concentrations and Ag diffusion during the sintering process as can be observed from the scanning electron micrograph. Grain growth is considerably enhanced up to 4.05 μm in 1 mole% Ag doped 0.7PMN-0.3PZT, while the apparent density continuously increased up to 7.89 gm/cm3 in 1 mole% Ag doped 0.8PMN-0.2PZT, respectively. It was observed that 1 mole% Ag doped 0.7PMN-0.3PZT attained maximum values for the dielectric permittivity (ε RT = 3864) at room temperature and the dielectric permittivity at the Curie temperature (ε Tc = 26826), respectively. The ferroelectric properties exhibited optimum values of P r = 36.82 μC/cm2 and P s = 45.29 μC/cm2 in 1 mole% Ag doped 0.7PMN-0.3PZT, respectively while the E c showed a decreasing trend throughout the series. The piezoelectric properties (d 33 = 297 pC/N and k p = 0.377) were enhanced in 1 mole% Ag doped 0.4PMN-0.6PZT and 0.7PMN-0.3PZT, respectively.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 37 , Issue 1 , January 2007 , pp. 93 - 99
Copyright
© EDP Sciences, 2006

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