Resumo

VILLAQUIRAN RAIGOZA, Claudia Fernanda. REMOVAL OF NICKEL AND COD PRESENT IN WASTEWATERS FROM AUTOMOTIVE INDUSTRY BY ELECTROCOAGULATION. Rev.EIA.Esc.Ing.Antioq [online]. 2013, n.19, pp.143-150. ISSN 1794-1237.

0,90Pb(Zn_1/3Nb_2/3)O₃-0,05PbTiO₃-0,05BaTiO₃ (PZN-5PT-5BT) ceramic powders, with majority perovskite phase, were synthesized using the columbite method. These powders were shaped into cylindrical pellets, which had two different mass/area ratios. The pellets were sintered within 1040 and 1150°C during one hour and under a rich lead oxide atmosphere. The percentage of perovskite phase, for both powders and ceramics (surface and interior), was obtained by X-rays diffraction spectrum, where it was observed that ceramic samples present higher percentage of perovskite phase and the highest density value when sintered at 1100 °C during one hour. Morphology was analyzed using scanning electron microscopy. It revealed that the mass/area ratio influences the stabilization of the perovskite phase within the sintering process, the bigger the content of mass for area unit the more stable the perovskita phase.

Palavras-chave : PZN-5PT-5BT; ferroelectric ceramics; mass/area relation; sintering.

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