Study on MnO2 doped(K0.48Na0.52)(Nb0.98Sb0.02)O3 lead-free piezoelectric ceramics
(K0.48Na0.52)(Nb0.98Sb0.02)O3+x％MnO2(x=0.25,0.5,0.75,1.00,1.5,2.0)piezoelectric ceramics were syn-thesized by solid state reaction method.The phase structure and microstructure of ceramics were characterized by X-ray diffrac-tion(XRD),scanning electron microscopy(SEM),and energy dispersive spectroscopy(EDS).The piezoelectric constant(d33),dielectric constant(εr),dielectric loss(tanδ),temperature stability of samples were tested.The effects of MnO2 doping amount and sintering temperature on properties and high-temperature stability were studied.The results indicated that doping an appro-priate amount of MnO2 could change the phase structure of(K0.48Na0.52)(Nb0.98Sb0.02)O3 ceramics from single phase to coexis-tence multiphase,and increase the density of the ceramics.When x=1.0 and sintered at 1 080 ℃,εr=986.34;x=0.5 and sintered at 1 040 ℃,the samples exhibited better performance:d33=135 pC/N,tan δ=0.22％.Moreover,the piezoelectric per-formance of samples had a good temperature stability within the range of 25～180 ℃.
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