By introducing organic species into the raw oxide powders before ball milling, pure perovskite (1-x)Pb(Ni_1/3Nb_2/3)O₃–xPbTiO₃ (PNN-PT) powers and ceramics with the morphotropic phase boundary (MPB) composition at x=0.36 (0.64PNN-0.36PT) have been successfully synthesized via organics-assisted solid state reaction. Organics, like ethylene glycol, polyethylene glycol, ethylene glycol butyl ether and triethylene glycol dimethyl ether, are adopted. In order to examine the effect of additive organics, PNN-PT powders and ceramics are aslo prepared via conventional solid state reaction for comparison. The XRD results display that the introduction of the above organics facilitates the formation of the perovskite phase. The TG/DSC analysis demonstrates that the decomposition of additive organics is delayed by the connections between PbO and organics. FT-IR also indicates that there are interactions between PbO and additive organics. We propose that interactions between PbO and oxygen atoms in the organic chains favor the formation of the perovskite phase. Consequently, pure perovskite phase has been attained in PNN-PT powders with the assistance of organics. In contrast, pyrochlore phases still remain in PNN-PT powders prepared by conventional solid state reaction. The dielectric and piezoelectric properties of PNN-PT ceramics have been measured. It is shown that PNN-PT ceramics prepared via organics-assisted route, exhibit excellent electrical performance, which is higher than that of PNN-PT ceramics prepared via conventional solid state reaction.

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