以分析纯Mg(OH)2、Ca(OH)2为原料,按m(MgO)∶m(CaO)=75∶25配料,并分别加入质量分数为O、0.5％、0.75％、1％的分析纯CeO2为掺杂剂,通过行星球磨机混合后机压成型,经1 650℃3h热处理,制备了MgO-CaO材料.通过XRD、SEM及四探针高温电导率测定仪对试样进行了分析.结果表明:随CeO2掺入量的增大,试样的体积密度逐渐增大,显气孔率减小,致密化程度增强;在烧结致密化过程中,试样晶粒间的气孔逐渐减少,但MgO晶粒中的气孔逐渐增多,而CaO晶粒中未有气孔出现;CeO2的引入可增强试样的导电性能,其实质在于CeO2与CaO发生置换固溶,增大了Ca2+空位的浓度,有利于Ca2+的扩散.
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