【摘要】 采用新的两步固相反应法,制备单相（Fe1/2Nb1/2）4+掺杂CaCu₃Ti₄O₁₂陶瓷,掺杂浓度在50 mol%到60 mol%之间,观察粉末X射线衍射谱,没有发现任何杂相.探索样品的最佳烧成制度,制备出致密性高的陶瓷.分析样品的阻抗特性,发现样品存在与晶界有关的热激活电导响应,随着（Fe1/2Nb1/2）4+掺杂浓度增加,晶界的电导激活能增加.进一步探究发现,晶界的电导响应可能与直流电导过程相关.这里采用新的两步固相反应法,成功地制备出了（Fe1/2Nb1/2）4+高浓度掺杂的单相CaCu₃Ti₄O₁₂样品,为今后研究（B1-xB′x）4+形式的复合离子高水平地替代CaCu₃Ti₄O₁₂中的Ti4+提供了制备方法上的新思路.更多还原

【Abstract】 Single-phase（Fe1/2Nb1/2）4+doped CaCu₃Ti₄O₁₂ ceramics are prepared by the two-step solid state reaction method and the doping concentration of（Fe1/2Nb1/2）4+complex ions is in the range from 50 mol% to 60 mol%.No secondary phase is found in the powder X-ray diffraction pattern.The optimal sintering system is studied for preparing the ceramics with high densification.A thermally activated electrical response,which is associated with grain boundary,is found by analyzing the impedance characteristics and the grain boundary activation energy for conduction increases with the（Fe1/2Nb1/2）4 +doping.Through further studies,this electrical response may be related with dc conduction process.The single-phase CaCu₃Ti₄O₁₂ ceramics with high concentrations of（Fe1/2Nb1/2）4 +doping are prepared by the two-step solid state reaction method.This new method provides a new approach for preparing the single-phase CaCu₃Ti₄O₁₂ ceramics with high substitution level of（B1-xB′x）4+for Ti4+.更多还原