本論文旨在研究金屬摻雜SDC固態電解質應用於氧氣感測器的影響，摻雜的金屬分別包括Sr、Bi、Pr、Gd和Ga。當摻雜金屬在SDC電解質中的含量由0增加至6mol%時，Sm的含量則從20減少至14mol%。固態電解質的粉體是使用檸檬酸鹽法製備而得。利用檸檬酸鹽前導化合物經鍛燒、壓錠及燒結完成所需之電解質錠片，而此錠片則以愛克斯光繞射儀、阿基米德液體媒介法、場發射掃瞄式電子顯微鏡及交流阻抗分析儀等設備或方法來進行分析，最後再封裝成氧氣感測器進行感測。
基於愛克斯光繞射儀分析的結果，金屬摻雜於SDC所分析出來的特性峰皆是符合螢石結構的立方晶系，但只有摻雜Sr能有效的取代本位離子（Ce4+），而摻雜Ga則會有少部分形成Sm3Ga5O12。由場發射掃瞄式電子顯微鏡的圖片顯示摻雜Sr或Ga的平均粒徑大小分別最大成長至5.2μm及0.98μm，而其餘金屬摻雜的電解質錠片則約為0.64μm左右。交流阻抗分析的結果顯示在350~650℃溫度範圍及1% O2的氣氛中，摻雜Gd能有效提升其固態電解質的導電度。
從O2感測特性結果可知，應答時間最短的電解質是Bi摻雜SDC（65s），回復時間最短的電解質是SDC（66s），感度最佳的電解質是Gd摻雜SDC（0.568 nA/ppm）。

The main purpose of this study is to investigate the impact of metal doping on Samarium doped ceria (SDC) used as solid electrolyte for oxygen sensor. The doping metals include Sr, Bi, Pr, Gd and Ga. Samarium content in the electrolytes varied from 20 to 14 mol% while the content of doping metal varied from 0 to 6 mol%. The solid electrolytes were prepared through nitrate-citrate combustion method. The citrate precursors were then calcined, pressed and sintered to form required pellets. The pellets were characterized by XRD, Archimedes method, FE-SEM and AC impedance, and finally tested in the assembled oxygen sensors.
Based on XRD spectra, it is found the metal-doped SDC are cubic fluorite lattice, but only doping Sr can effectively substitute the host site ion (Ce4+). For the Ga doping, part of Ga will react with Sm to form Sm3Ga5O12 cubic crystals.
FE-SEM photos show that the average grain size is 5.2μm and 0.98μm for Sr and Ga doping, respectively, and 0.64μm for other metal doping. The results obtained from AC impedance show that the electrical conductivity of SDC can be improved by doping Gd at temperature range 350-650℃ in 1% O2 atmosphere.
Oxygen sensing analysis show that the fastest response-time electrolyte is Bi-doped SDC(65s), the shortest recovery-time electrolyte is SDC(66s), and the best sensitivity electrolyte is Gd-doped SDC(0.568 nA/ppm).

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