【摘要】 采用传统固相法制备了CaCu_（3-x）Zn_xTi₄O₁₂（CCTO,x=0,0.04,0.08,0.12）陶瓷。用X线衍射仪和扫描电子显微镜研究了Zn²⁺掺杂含量的变化对CaCu_（3-x）Zn_xTi₄O₁₂陶瓷的相结构、微观形貌的影响规律,并研究了CaCu_（3-x）Zn_xTi₄O₁₂陶瓷的低、高频介电性能。结果表明,少量Zn²⁺的加入影响CaCu_（3-x）Zn_xTi₄O₁₂陶瓷的相结构和微观形貌。在低频范围内,CaCu_（3-x）Zn_xTi₄O₁₂陶瓷均具有巨介电常数（>104）,且CaCu_2.92Zn_0.08Ti₄O₁₂陶瓷的介电常数温度依赖性小,介电损耗最小,这加速了CCTO陶瓷在陶瓷电容器方向应用的潜力。在微波频段（5.85⁸.2GHz）范围内,CaCu_（3-x）Zn_xTi₄O₁₂陶瓷均具有介电弛豫现象,CaCu_（3-x）Zn_xTi₄O₁₂陶瓷的介电常数实部随掺杂量的增加而减小,介电常数虚部和损耗对应的频率变化趋势与实部一致。更多还原

【Abstract】 The CaCu_（3-x）Zn_xTi₄O₁₂（x=0,0.04,0.08,0.12）（CCTO）ceramics have been prepared by the solid state reaction.The effects of the change of Zn²⁺doping contents on the phase structure and the morphology of CCTO have been investigated by the X-ray diffraction and the scanning electron microscopy,and the low/microwave frequency dielectric properties of CCTO ceramics have also been studied.The results indicate that the addition of small amount of Zn²⁺doping can influence the phase structure and morphology of CCTO.All the ceramics show the giant dielectric constant（>104）,and the CaCu_2.92Zn_0.08Ti₄O₁₂ ceramics show the higher dielectric constant,stable temperature dependence of dielectric constant and the lower dielectric loss at the lower frequency.This study is beneficial to design CCTO-based materials and promote their application such as in capacitors.Meanwhile,the dielectric relaxation character exist in the CaCu_（3-x）Zn_xTi₄O₁₂ ceramics at the microwave frequency of（5.85⁸.2 GHz）band.更多还原