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研究了Al_2O_3掺杂方式对Ce_(0.8)Sm_(0.2)_(1.9)(SDC)材料性能的影响。用XRD、SEM、XEDS和热膨胀系数仪等检测手段对样品的晶体结构、力学、热学、显微结构和微区元素进行检测分析。结果表明:采用低温燃烧一步合成法制备的样品其力学性能、烧结性和离子电导率均优于采用铝溶胶直接添加法所制备的样品,其主要原因在于铝溶胶直接添加法会在SDC材料中产生残留Al_2O_3,并富集在晶界处形成晶界夹杂,阻碍了氧离子迁移。
The effect of Al_2O_3 doping on the properties of Ce_ (0.8) Sm_ (0.2) _ (1.9) (SDC) materials was investigated. The crystal structure, mechanical, thermal, microstructure and micro-elements of the samples were detected by XRD, SEM, XEDS and thermal expansion coefficient. The results show that the mechanical properties, sinterability and ionic conductivity of samples prepared by one-step combustion synthesis are superior to those prepared by the direct addition of aluminum sol. The main reason for this is that the direct addition of aluminum sol in SDC materials Residual Al_2O_3 was generated and enriched in the grain boundary to form intergranular inclusions, hindering the migration of oxygen ions.