Influence of CuO addition on dielectric and piezoelectric properties of (Bi0.5Na0.5)TiO3-BaTiO3 lead-free piezoceramics

M. DIFEO; L. RAMAJO ; M. CASTRO

Journal of Advanced Dielectrics

World Scientific

Año: 2021 vol. 11

2010-135X

Doping effects of CuO on sintering behavior and electrical properties of 0.94(Bi0.5Na0.5)TiO3?0.06(BaTiO3)-xCuO (BNTBT6-xCu) lead-free piezoceramic obtained by the conventional solid-state reaction method were investigated. Regarding the undoped system, it is already known that it presents the best densification values when it is sintered at 1150 ºC, however, the doped system was sintered at 1150 ºC, 1100 ºC, 1050 ºC, 1025 ºC, and 975 ºC to determine the effect of Cu on densification process. Therefore, it was obtained that the CuO-doped samples sintered at 1050 ºC presented the highest density values and therefore were the ones chosen to perform the characterization tests together with the undoped system. The samples were characterized using X-ray diffraction (XRD), Raman microspectroscopy, and scanning electron microscopy (SEM) analysis, whereas ferroelectric and dielectric properties were evaluated by means of ferroelectric hysteresis loops and impedance spectroscopy studies. As a result, the addition of CuO allowed an improvement in sinterability and densification, with the subsequent grain growth, and the improvement of the piezoelectric coefficient (d33).