以CaO和TiO2为原料,采用固相反应烧结法合成钛酸钙陶瓷.以CeO2为添加剂,重点研究CeO2掺杂对合成钛酸钙陶瓷烧结性能及微观结构的影响.利用XRD、SEM、EDS等手段对试样的物相组成、显微形貌以及元素分布进行表征.通过X'pert High score Plus软件研究CeO2添加量和煅烧温度对合成钛酸钙的相组成、晶胞参数、缺陷反应的影响.结果表明:随着CeO2加入量的增大,Ce4+与Ti4+及Ce3+与Ca2+之间发生取代,致使钛酸钙的晶体结构发生畸变,晶格常数以及晶胞体积出现了先增大后减小的趋势.CaTiO3结构中取代位置的改变,是造成晶胞体积呈非线性变化趋势的原因.形成的结构缺陷加速了固相烧结反应,钛酸钙晶粒由发育不完全的台阶状转变为规则的多边形.过量的CeO2会抑制晶粒的生长,减小晶粒尺寸.随着煅烧温度的升高,结构中热缺陷浓度增大,促进了钛酸钙的烧结.
CaTiO3 ceramics were prepared via solid-state reaction method using CaO and TiO2 as main raw materials.The effects of CeO2 additive on the sintering property and microstructure of CeO2-doping ceramic were mainly studied.The crystalline phase composition, microstructure and sintering characteristics of the specimens were investigated by XRD, SEM, EDS and so on.The lattice parameters and cell volume of CaTiO3 were determined and calculated by X'pert High score Plus software.The results show that the lattice parameters and lattice volume of Ce-doping CaTiO3 are affected by the substitution of Ce3+ for Ca2+ and Ce4+ for Ti4+ in the structure of CaTiO3.With increasing the additive, the lattice parameters and lattice volume increase first and then decrease.Structure defect of solid solution accelerated diffusion of ion and promoted synthesis rate of CaTiO3, resulting in the increase of grain size.The shape of crystal grain change from steps' morphology to regular polygons with excessive addition of CeO2, while the average crystal size decrease.Thermal defects caused by higher sintering temperature also promote the solid reaction and sintering of synthetic CaTiO3.
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