【摘要】 通过固相合成法制备了xBi（Zn,Zr）O₃-（1-x）（Ba,Ca）（Ti,Zr）O₃（BCTZ-xBZZ,x=0,0.005,0.02,0.04,0.06）无铅陶瓷体系，结合X射线衍射（XRD）、扫描电镜（SEM）、介电等表征，探讨了Bi（Zn,Zr）O₃陶瓷体系对（Ba,Ca）（Ti,Zr）O₃陶瓷的晶相、微结构、介电以及其温度稳定性的影响。研究结果表明：当预烧温度高于850℃时BCTZ-xBZZ合成粉体已基本形成单一的钙钛矿结构。在较低的烧结温度（1200～1300℃）下BCTZ-xBZZ陶瓷可以很好地烧结。所有BCTZ-xBZZ陶瓷都具有纯钙钛矿相，与此同时，陶瓷体系晶相经历了从四方晶相向伪立方相过渡。Bi(Zn_0.5Zr_0.5)O₃显著影响了（Ba,Ca）（Ti,Zr）O₃陶瓷体系相变温度：铁电相-铁电相(T_FE)，铁电相-顺电相（T_c）。并且陶瓷体系存在弛豫行为，在高温范围内，修正的居里外斯定律1/ε_r-1/ε_r,m=C（T-T_m）^α可以很好地用来解释Bi(Zn_0.5Zr_0.5)O₃-(Ba_0.98Ca_0.02)(Ti_0.95Zr_0.05)O₃陶瓷体系的介电弛豫性。这归因于在A位和B位中无序性离子的共同作用。此外，陶瓷体系0.96(Ba_0.98Ca_0.02)(Ti_0.95Zr_0.05)O₃-0.04Bi(Zn_0.5Zr_0.5)O₃在-25～135℃温度范围中，具有较稳定的电容温度系数（大约在±15%）和低的介电损耗（<0.1）。这表明该陶瓷在电容器中具有潜在的应用。更多还原

【Abstract】 xBi（Zn,Zr）O₃-（1-x）（Ba,Ca）（Ti,Zr）O₃（BCTZ-xBZZ,x=0,0.005,0.02,0.04,0.06）lead-free ceramics have been prepared by the conventional ceramic process.The influence of Bi（Zn,Zr）O₃ on structure and dielectric temperature stability of （Ba,Ca）（Ti,Zr）O₃ ceramics were systematically studied by use of XRD,SEM,dielectric measurement.The results indicate that when the calcination temperatures are higher than850℃,the BCTZ-xBZZ powders have basically formed a single perovskite structure.The ceramics are well sintered at a relatively low temperatures （1200～1300℃） by doping with Bi（Zn,Zr）O₃.All BCTZ-xBZZceramics possess pure single phase of perovskite structure,and the ceramics transfer from T phase to Pc phase.The ferroelectric-ferroelectric phase transition temperatures (T_FE) and ferroelectric-paraelectric phase transition temperatures（T_c） of BCTZ ceramics are significantly affected by the addition of BZZ.Temperature dependence of the dielectric properties indicates that as the concentration of BZZ increases,the BCTZ-xBZZ solid solution ceramics exhibit more relaxor-like behavior.The thermal variation of the relative permittivity is well explained by the modified law 1/ε_r-1/ε_r,m=C（T-T_m）^α in the high temperature range.The relaxor behavior for Bi(Zn_0.5Zr_0.5)O₃-(Ba_0.98Ca_0.02)(Ti_0.95Zr_0.05)O₃ ceramics is ascribed to the combination of cation disorder from A-sites and B-sites.In addition,the 0.96(Ba_0.98Ca_0.02)(Ti_0.95Zr_0.05)O₃-xBi(Zn_0.5Zr_0.5)O₃ceramics （x=0.04） has a stable temperature coefficient of capacitance （±15%） and low dielectric loss （<0.1）in the temperature range of-25～135℃,which demonstrates that the BCZT-xBZZ ceramics have a latent utilization in ceramic capacitors.更多还原