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沉淀剂对胶质溶液喷雾热解Sm_(0.2)Ce_(0.8)O_(1.9)固体电解质结构的影响(英文)

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Abstract:

分别采用碳酸铵((NH4)2CO3,AC)和碳酸氢铵(NH4HCO3,AHC)作沉淀剂制备胶质溶液,利用胶质溶液喷雾热解制备纳米晶氧化钐掺杂氧化铈(Sm0.2Ce0.8O1.9,SDC)电解质粉末。通过X射线衍射、热重分析和扫描电镜表征粉末和陶瓷的结构和形貌,探讨沉淀剂对前驱体和SDC粉末形貌、粒径和结晶相的影响及作用机理。结果表明通过AC途径制备的喷雾热解粉末呈球状,经700℃热处理后,得到的SDC粉末聚集体粒径小于0.5μm,具有很高的烧结活性,经1250℃烧结4h获得的陶瓷密度达到理论密度的96%;通过AHC途径制备的喷雾热解粉末经热处理后仍保持片状,相应的陶瓷呈多孔结构,只有理论密度的79%。

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