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Dielectric, relaxor and ferroelectric characterization of La doped xPb(Mg1/3Nb2/3)O3-(1 − x)Pb(Zr0.55Ti0.45)O3 ceramics

Published online by Cambridge University Press:  23 June 2006

K. Ramam  and
S. H. Luis
K. Ramam*
Affiliation:
Departmento de Ingeneria de Materials, (DIMAT), Facultad de Ingenieria, Universidad de Concepcion, Edmundo Larenas 270, Casilla 160 C, Concepcion, Chile
S. H. Luis
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 relaxor ferroelectric ceramics of La doped xPb(Mg1/3Nb2/3)O3-(1 − x)Pb(Zr0.55Ti0.45)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. $\varepsilon_{RT}$ and tan δ are increased to 1.5 mole% La doped PMN-PZT compositions while $\varepsilon_{T_C}$ and TC 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 (Ec, Pr and Ps) are increased to 1.5 mole% La doped PMN-PZT composition. 77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 35 , Issue 1 , July 2006 , pp. 49 - 55
Copyright
© EDP Sciences, 2006

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