Resumo

RAIGOZA, C. F. V; EIRAS, J.A.; KIMINAMI, Ruth H. G. A  e  GARCIA, D. Densification of PZN-10PT ceramics from powders obtained by the combustion reaction synthesis. ing.cienc. [online]. 2014, vol.10, n.20, pp.11-21. ISSN 1794-9165.

((1-x)Pb(Zn_1/3Nb_2/3)O₃-xPbTiO₃-(1-x)PZN-xPT) single crystals with perovskite structure near to the morphotropic phase boundary (MPB), x0; 09, exhibit unusual large dielectric and piezoelectric constants. Preparation of PZN-PT ceramics with composition near to the MPB using conventional methods leads to ceramics with pyrochlore structure. In this paper, ((1 - x)Pb(Zn_1/3Nb_2/3)O₃-xPbTiO₃-PZN-xPT) powders with x = 0; 10 were synthetized by the combustion reaction method. CO(NH₂)₂, C₂H₅NO₂, CO(NH₂)₂/C₂H₅NO₂ y C₄H₁₆N₆O₂ were used as fuels. Results show that a maximum of 70% of perovskite phase was obtained using CO(NH₂)₂= C₂H₅NO₂ (in relation 50/50). The afore mentioned phase is preserved when sintering the sample at 1000 ° C, during 4h on nitrogen atmosphere.

Palavras-chave : PZN-PT; perovskite phase; combustion synthesis; dilatometry.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )