Influencia de la adición de CuO sobre las propiedades dieléctricas y piezoeléctricas de cerámicos K1/2Na1/2NbO3

AUTOR(ES)

Ramajo, Leandro A., Taub, Jonathan, Castro, Miriam S.

FONTE

Matéria (Rio J.)

DATA DE PUBLICAÇÃO

2013-12

RESUMO

In this paper the influence of Cu on dielectric and piezoelectric properties of K1/2Na1/2NbO3 (KNN) was evaluated. Samples were obtained by solid state reaction doping with CuO (0 to 2 mol%). The obtained samples were characterized by the Archimedes method, X-Ray diffraction, Raman spectroscopy, Scanning Electron Microscopy, polarization curves, piezoelectric constant (d33) and impedance spectroscopy at room temperature. In general, it was observed that doping does not improve dielectric and piezoelectric properties. Small amounts of CuO (0.5 mol%) slightly affected the densification process, while high concentrations increased the porosity of the samples. Also, low concentrations of CuO drastically reduced d33 values, presumably due to the hardening effect of the additive.

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