Doping effects of CuO on the sintering behavior and electrical properties of 0.94(Bi_(0.5)Na_(0.5))TiO_(3)-0.06(BaTiO_(3))-xCuO(BNT-BT6-xCu)lead-free piezoceramic obtained by the conventional solid-state reaction meth...Doping effects of CuO on the sintering behavior and electrical properties of 0.94(Bi_(0.5)Na_(0.5))TiO_(3)-0.06(BaTiO_(3))-xCuO(BNT-BT6-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℃,however,the doped system was sintered at 1150℃,1100℃,1050℃,1025℃,and 975℃ to determine the effect of Cu on the densification process.Therefore,it was obtained that the CuO-doped samples sintered at 1050℃ 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 the 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(d_(33)).展开更多
基金The authors would like to thank National University of Mar del Plata(Argentina)Project(15/G577)for providing financial support.
文摘Doping effects of CuO on the sintering behavior and electrical properties of 0.94(Bi_(0.5)Na_(0.5))TiO_(3)-0.06(BaTiO_(3))-xCuO(BNT-BT6-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℃,however,the doped system was sintered at 1150℃,1100℃,1050℃,1025℃,and 975℃ to determine the effect of Cu on the densification process.Therefore,it was obtained that the CuO-doped samples sintered at 1050℃ 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 the 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(d_(33)).
