Eur. Phys. J. Appl. Phys. 35, 49-55 (2006)
https://doi.org/10.1051/epjap:2006066

Dielectric, relaxor and ferroelectric characterization of La doped xPb(Mg_1/3Nb_2/3)O₃-(1 − x)Pb(Zr_0.55Ti_0.45)O₃ ceramics

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

Corresponding author: ramamk@udec.cl

Received: 24 October 2005
Revised: 11 March 2006
Accepted: 7 April 2006
Published online: 23 June 2006

Abstract

The relaxor ferroelectric ceramics of La doped xPb(Mg_1/3Nb_2/3)O₃-(1 − x)Pb(Zr_0.55Ti_0.45)O₃ are synthesized by columbite precursor method. Powder X-ray diffraction patterns of these compositions indicate pseudocubic phase formation. Grain growth is inhibited with La doping and is increased with PMN concentration in PMN-PZT ceramics. and tan δ are increased to 1.5 mole% La doped PMN-PZT compositions while and T_C are decreased with La modification in PMN-PZT system. Pure and La modified 0.8PMN-0.2PZT compositions have shown the most promising relaxor behavior useful for multilayer capacitor (MLC) applications. The ferroelectric properties (E_c, P_r and P_s) are increased to 1.5 mole% La doped PMN-PZT composition. 77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc.