(1. 東北大學(xué) 資源與土木工程學(xué)院，沈陽(yáng) 110004；
2. 沈陽(yáng)化工大學(xué) 應(yīng)用化學(xué)學(xué)院，沈陽(yáng) 110142；
3. 東北大學(xué) 材料各向異性與織構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室，沈陽(yáng) 110004)
摘 要: 以尿素為沉淀劑，Sm2O3 和 Ce(NO3)3·6H2O為起始原料，采用均相沉淀法制備Sm3+摻雜CeO2基納米固溶體Ce0.8Sm0.2O1.9 (SDC)。利用TG-DTA、XRD、SEM和BET等手段對(duì)前驅(qū)體的熱分解行為和SDC粉體的性能進(jìn)行表征，研究焙燒溫度對(duì)SDC粉體粒徑和燒結(jié)性能的影響。結(jié)果表明：隨焙燒溫度的升高，晶粒尺寸逐漸增大；700 ℃焙燒的前驅(qū)體是具有良好結(jié)晶性能的類球形螢石型結(jié)構(gòu)固溶體，晶粒尺寸為15 nm，粒子間僅有較弱的軟團(tuán)聚；該粉體具有較好的成型和燒結(jié)性能，將素坯在1 400 ℃保溫2 h，得到相對(duì)密度高于95%、平均粒徑約為0.6 μm的固體電解質(zhì)陶瓷體。
關(guān)鍵字: 納米級(jí)固溶體；稀土；均相沉淀；摻雜氧化鈰；尿素
urea homogeneous precipitation
（1.College of Resources and Civil Engineering, Northeastern University, Shenyang 110004, China;
2. College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China;
3. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education,
Northeastern University, Shenyang 110004, China）
Abstract:Sm3+ doped CeO2 powders (SDC) were prepared by homogeneous precipitation method using Sm2O3 and Ce(NO3)3·6H2O as the raw materials and CO(NH2)2 as the precipitant. The evolution behavior of the precursor in the heating process and the properties of the SDC powders were characterized by TG-DTA, XRD, SEM and BET method, respectively. The effects of calcination temperature on the grain size and sinterability of the SDC powders were studied. The results show that the average grain size increases with increasing temperature. The precursor calcined at 700 ℃ is a single cubic fluorite-type structure with nearly spherical shape and weakly aggregated. The grain size of the powder is 15 nm. In addition, the SDC powders have good sinterability in the experiment and the sintered specimens with relative density up to over 95% and average grain size of 0.6 μm can be manufactured at 1 400 ℃ for 2 h under simply processing conditions.
Key words: nano-scale solid solution; rare earths; homogeneous precipitation; doped ceria; urea
