CuO掺杂对NaNbO3–BaTiO3无铅压电陶瓷性能的影响

EFFECTS OF CuO DOPPING ON PROPERTIES OF NaNbO_3–BaTiO_3 LEAD-FREE PIEZOELECTRIC CERAMICS

利用传统烧结法制备CuO掺杂NaNbO3–BaTiO3无铅压电陶瓷,研究不同CuO掺量(0、0.1%、0.2%、0.3%、0.4%、1.0%和2.0%,摩尔分数)对样品显微结构、物相组成及电性能的影响。结果表明:CuO掺量对物相组成、压电性能、铁电性能及介电性能都有显著影响。当CuO掺量从0增大到0.3%时,压电性能增高;当CuO掺量超过0.3%时,压电性能明显下降。当CuO掺量为0.3%时,样品的综合性能最佳:压电常数(d33)为150pC/N,介电损耗(tanδ)为0.0174,机电耦合系数(kp)为30.19%,剩余极化强度(Pr)为13.5μC/cm2,矫顽场(Ec)为1.94kV/mm。

Lead-free NaNbO3 （NN）–BaTiO3 （BT） piezoelectric ceramics were prepared by the traditional sintering method. The ef-fects of different CuO contents （0,0.1%,0.2%,0.3%,0.4%,1.0%,and 2.0% in mole） on microstructure,phase composition and elec-tric properties of obtained samples were studied. The results show that the phase composition,piezoelectric,dielectric and ferroelec-tric properties of the lead-free ceramics are much influenced by the contents of doped CuO. The piezoelectric properties are enhanced when CuO content increases from 0 to 0.3%,and decrease when CuO content is more than 0.3%. When CuO content is 0.3%,the highest electric properties of piezoelectric constant d33 = 150 pC/N,dielectric loss tan δ = 0.017 4,planar coupling factor kp = 30.19%,remanent polarization Pr = 13.5 μC/cm2,and coercive electric field Ec = 1.94 kV/ mm are achieved,respectively.