Issue Eur. Phys. J. Appl. Phys. Volume 37, Number 1, January 2007 Page(s) 93 - 99 Section Characterization of Materials: Imaging,\ Microscopy and Spectroscopy DOI 10.1051/epjap:2006156 Published online 13 December 2006

Eur. Phys. J. Appl. Phys. 37, 93-99 (2007)
DOI: 10.1051/epjap:2006156

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

R. Koduri and M. Lopez

Departmento de Ingeneria de Materials, (DIMAT), Facultad de Ingenieria, Universidad de Concepcion, Edmundo Larenas 270, Casilla 160 C, Concepcion, Chile

ramamk@udec.cl

(Received: 5 June 2006 / Received in final form: 18 September 2006 / Accepted: 4 October 2006 / Published online: 13 December 2006 )

Abstract
The ferroelectric and piezoelectric properties of Ag doped xPb(Mg_1/3Nb_2/3)O₃-(1-x) Pb(Zr_0.532Ti_0.468)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 m 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 ( ) at room temperature and the dielectric permittivity at the Curie temperature ( ), respectively. The ferroelectric properties exhibited optimum values of P_r = 36.82 C/cm² and P_s = 45.29 C/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 ( d₃₃ = 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.

PACS
77.84.-s - Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials.
77.84.Dy - Niobates, titanates, tantalates, PZT ceramics, etc..
77.80.Dj - Domain structure; hysteresis.
77.22.-d - Dielectric properties of solids and liquids.

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