| In this paper,the(Ba0.85Ca0.15)(Zr0.1Ti0.9)O3-based lead-free piezoelectric ceramics were obtained by the conventional solid-state ceramic route and were modified by the optimization of preparation process and the ion doping.The effects of dopants on the phase structure,microstructure,piezoelectricity,dielectric and ferroelectric properties of ceramics were studied systematically.Inthispaper,themicrostructureandelectricalpropertiesof(Ba0.85Ca0.15)(Zr0.10Ti0.90)O3-xmol%CuO samples?x=0.0,0.5,1.0,1.5 and 2.0?and(Ba0.85Ca0.15)(Zr0.10Ti0.90)1-x(Cu1/3Nb2/3)xO3 samples?x=0.00,0.005,0.01,0.015 and0.02?were investigated.The XRD patterns confirmed the formation of pure perovskite structure,which indicated that the Cu and Nb had been totally in the crystal lattice.At the same time,the influence of sintering temperature and ion doping on its electrical properties was studied systematically.After process optimization(Ba0.85Ca0.15)(Zr0.10Ti0.90)O3-1.0mol%CuO ceramics,the optimal electrical properties property of d33=505 pC/N,?r=4726,tan?=0.0086 were obtained for the(Ba0.85Ca0.15)(Zr0.10Ti0.90)O3-1.0mol%CuO ceramic sintered at 1400°C for 4 h.The optimal electrical properties property of TR-T=21°C,?=5.61 g/cm3,Pr=12.6?C/cm2,d33=550pC/N,Kp=50%,?r=6056,tan?=0.0155wereobtainedforthe(Ba0.85Ca0.15)(Zr0.10Ti0.90)0.99(Cu1/3Nb2/3)0.01O3 ceramic sintered at 1400°C for 4 h.Inthispaper,themicrostructureandelectricalpropertiesof(Ba0.85Ca0.15)(Zr0.10Ti0.90)O3-xmol%ZnO samples?x=0.00,0.03,0.06,0.12 and 0.24?and(Ba0.85Ca0.15)(Zr0.10Ti0.90)1-x(Zn1/3Nb2/3)xO3 samples?x=0.0009?0.0018?0.0027 and0.0036?were investigated.The XRD patterns confirmed the formation of pure perovskite structure,which indicated that the Zn and Nb had been totally in the crystal lattice.At the same time,the influence of sintering temperature and ion doping on its electrical properties was studied systematically.After process optimization(Ba0.85Ca0.15)(Zr0.10Ti0.90)O3-0.06mol%ZnO ceramics,the optimal electrical properties property of d33=621 pC/N,?=4928,?=5.44 g/cm3 were obtained for the(Ba0.85Ca0.15)(Zr0.10Ti0.90)O3-0.06mol%ZnO ceramic sintered at 1450°C for 4 h.The optimal electrical properties property of d33=586 pC/N,?rmax=4310,tan?=0.023,?=5.44 g/cm3 were obtained for the(Ba0.85Ca0.15)(Zr0.10Ti0.90)0.9982(Zn1/3Nb2/3)0.0018O3ceramic sintered at 1450°C for 4 h.In this paper,the effects of V2O5 doping on the microstructure,composition,sintering temperature and electrical properties of(Ba0.85Ca0.15)(Zr0.10Ti0.90)O3-xmol%V2O5?x=0.05,0.10,0.15,0.20,0.25,0.50,1.0 and 2.0?ceramics were investigated.The XRD patterns confirmed the formation of pure perovskite structure,which indicated that the V had been totally in the crystal lattice.At the same time,the influence of sintering temperature and ion doping on its electrical properties was studied systematically.The optimal electrical properties property of d33=466 pC/N,?r=3104,tan?=3.0%,Kp=32%were obtained for the(Ba0.85Ca0.15)(Zr0.10Ti0.90)O3-0.20mol%V2O5 ceramic sintered at 1350°C for 4 h. |
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