摘要：以Ce(NO₃)₃.6H₂O和ZrOCl₂.8H₂O为原料,以尿素为沉淀剂,利用微波均相法制备Ce_0.75Zr_0.25O₂粉体,采用热分析仪、X射线衍射仪、扫描电子显微镜表征制备的粉体,对制备的粉体压制成型并烧结,用扫描电子显微镜观察烧结体的微观结构。结果表明,合成Ce_0.75Zr_0.25O₂前驱体时加入2倍于Ce³⁺物质的量的H₂O₂可以减小固溶体颗粒粒度,降低固溶温度30℃;所制备的固溶体粉体具有良好的烧结性,在1 550℃得到烧结体的相对密度达99.57%。

关键词：微波均相合成；可烧结性；固溶体

Abstract：Ce_0.75Zr_0.25O₂ powders were prepared by microwave-homogeneous reaction,using Ce(NO₃)₃.6H₂O,ZrOCl₂.8H₂O and(NH₂)2CO as raw materials.The Ce_0.75Zr_0.25O₂ powders was characterized by thermogravimetry-differential thermal analysis(TG-DTA),X-ray diffraction(XRD) and scanning electron microscope(SEM).Then the Ce_0.75Zr_0.25O₂ powders was shaped and sintered.The microstructure of sintered body was observed by SEM.The results show that H₂O₂ can decrease the size of particles and reduce the formation temperature of the solid solution by 30 ℃,when the added content of H₂O₂ is twice as much as the content of Ce³⁺.The resultant Ce_0.75Zr_0.25O₂ powders have good sinterabilty.The relative density of the sintered body is up to 99.57 % at 1 550 ℃.

Keywords ：microwave-homogeneous synthesis；sinterabilty；solid solution