Structural characterization of 0.5PbMg1/3Nb2/3O3-0.5BaxPb(1−x)TiO3 powders |
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| Authors: | JC Bruno TC Boni MA Zaghete |
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| Affiliation: | a Depto de Química, Instituto de Biociências, UNESP, Distrito de Rubião Junior, s/n, P.O. Box 510, Botucatu 18.618-000, SP, Brazil
b Liec, Instituto de Química, UNESP, Rua Prof. Francisco Degni, s/n, P.O. Box 355, Araraquara 14.801-970, SP, Brazil |
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| Abstract: | The present work reports the effects caused by barium on phase formation, morphology and sintering of lead magnesium niobate-lead titanate (PMN-50PT). Ab initio study of 0.5Pb(Mg1/3Nb2/3)O3-0.5(BaxPb(1−x)TiO3) ceramic powders, with x = 0, 0.20, and 0.40 was proposed, considering that the partial substitution of lead by barium can reestablish the equilibrium of monoclinic-tetragonal phases in the system. It was verified that even for 40 mol% of barium, it was possible to obtain pyrochlore-free PMN-PT powders. The increase of the lattice parameters of PMN-PT doped-powders confirmed dopant incorporation into the perovskite phase. The presence of barium improved the reactivity of the powders, with an average particle size of 120 nm for 40 mol% of barium against 167 nm for the pure sample. Although high barium content (40 mol%) was deleterious for a dense ceramic, contents up to 20 mol% allowed 95% density when sintered at 1100 °C for 4 h. |
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| Keywords: | A Ceramics C X-ray diffraction D Phase equilibria |
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