以化學共沉法製備氧化釤摻雜氧化鈰固溶體粉末應用於固態電解質之研究

Preparation of Samarium Doped Ceria for Solid Solution Powder by the Chemical Coprecipitation and Study of Application to Solid Electrolyte

呂記華(J.H. Lu) ； 溫紹炳(S.B. Wen) ； 傅彥培(Y.P. FU) ； 林志朋(C.P. Lin)

《鑛冶：中國鑛冶工程學會會刊》 51卷3期 (2007/09) Pp. 81-94

https://doi.org/10.30069/MM.200709_51(3).0007

摘要

本研究以化學共沉法製備Ce_(1-x)Sm_xO_(2-x/2)奈米級粉末，經過加壓成型、燒結後作為固態電解質，並利用XRD、SEM、BET，針對不同添加比例，分析粉末及燒結體的結晶相、顯微結構、緻密度，以及使用直流電法（DC-method）量測其導電率。以Sm^(3+)摻雜CeO_2固態電解質，可有效提高氧離子導電率，且隨著添加量的增加，氧空缺濃度增加，導電率也增加。在800℃時導電率由2.41×10^(-4)S／cm（CeO_2）提高到2.3×10^(-2)S／cm（Ce_(0.8)Sm_(0.2)O_(1.9)）。但當添加比例超過x=0.2時，導電率並沒有跟著增加，其原因是因為氧離子空位的有序化，缺陷締合以及靜電相互作用所造成的。活化能隨著添加比例增加而降低，在x=0.2活化能為0.892（eV），繼續增加會使活化能升高。

關鍵字

化學共沉法 ； 固態電解質

並列摘要

In this research, we adopted the method of ＂Chemical Coprecipitation＂ to produce Ce_(1-X)Sm_xO_(2-X/2) powder; and the powerder was pressed to shape and sintered, to become solid electrolyte. We used XRD, SEM, BET, to analyze the powders, and the solid electrolytes, the crystal phase, microstructure, and density We also used DC-method to measure their ionic conductivity. By adding Sm^(3+) to CeO_2 solid electrolytes could effectively increase the oxygen ion electric conductivity. With the increased amount of additives, the concentration of oxygen vacancy and the ionic conductivity increased. When the temperature reaches 800°C, the electric conductivity increased from 2.41×10^(-4)S/cm (CeO_2) to 2.3×10^(-2)S/cm (Ce_(0.8)Sm_(0.2)O_(1.9)). However, if the additive proportion exceeds x=0.2, the ionic conductivity did not proportionally increase. This happens due to ordering of vacancy of oxygen ion, flaw association, and static electricity. The activation energy is decreased by increasing the additive. When x=0.2, the active energy will be 0.892(eV), and if keeping increasing, the active energy would also increase.

並列關鍵字

Chemical Coprecipitation ； Solid Electrolyte