La3+掺杂Ca1-xLaxCu3Ti4O12陶瓷的制备及性能研究

采用固相反应法制备了La3+掺杂的CaCu3Ti4O12(CCTO)陶瓷,研究了La3+掺杂量对Ca1-xLaxCu3Ti4O12(x=0;,1;,3;,5;,7;)陶瓷物相结构、微观形貌和介电性能影响,对La3+掺杂影响CCTO陶瓷介电性能的机理进行了分析.结果表明:x为3;时,开始出现杂相;x高于5;时,陶瓷晶粒开始细化;La3+掺杂可以显著提高CaCu3Ti4O12陶瓷的介电常数,同时介电损耗在高频段也相应降低,从而有助于CCTO陶瓷的综合介电性能的提升.

Effect of La3 +Doping on the Microstructures and Dielectric Properties of Ca1 -xLaxCu3Ti4O12 Ceramics

CaCu3 Ti4 O12 ( CCTO ) ceramics doped by La 3+ were prepared by the solid state reaction method.The phase structures , microstructures, and dielectric properties of the Ca 1-x Lax Cu3 Ti4 O12 ( x=0%, 1%, 3%, 5%, 7%) ceramics were investigated .The mechanism of influence of La 3+doping on the dielectric properties of CCTO ceramics was analyzed .The results show when x is 3%, secondary phases appear , when x is higher than 5%, the ceramic grains become smaller , La3+doping remarkably increases the dielectric constant of CaCu 3 Ti4 O12 ceramics, and the dielectric loss also becomes lower than undoped CaCu 3 Ti4 O12 ceramics over the high frequency range , which improved the general dielectric properties of CCTO ceramics .