一种新的固相反应法制备高掺杂浓度的CaCu_3Ti_4O_(12)陶瓷  

A new solid state reaction method to prepare CaCu_3Ti_4O_(12) ceramics with the high doping concentration

作　　者：白璐[1] 吴裕功[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《天津理工大学学报》2016年第4期14-19,共6页Journal of Tianjin University of Technology

摘　　要：采用新的两步固相反应法,制备单相(Fe1/2Nb1/2)4+掺杂CaCu_3Ti_4O_(12)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CaCu_3Ti_4O_(12)样品,为今后研究(B1-xB′x)4+形式的复合离子高水平地替代CaCu_3Ti_4O_(12)中的Ti4+提供了制备方法上的新思路.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 tool%. 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＋.

关 键 词：CACU3TI4O12 固相反应法 复合掺杂 阻抗特性 

分 类 号：TM22[一般工业技术—材料科学与工程]