合成及電性能
(江蘇科技大學(xué) 數(shù)理學(xué)院，鎮(zhèn)江 212003)
摘 要: 采用固相反應(yīng)法合成一系列樣品Sm0.9Ca0.1Al1−xZnxO3−δ(x=0，0.03，0.05)。利用X射線(xiàn)衍射和掃描電鏡研究樣品的結(jié)構(gòu)、微觀形貌和燒結(jié)性能，用交流阻抗譜測(cè)量Sm0.9Ca0.1Al0.97Zn0.03O3−δ在500~1 000 ℃的電導(dǎo)性能。結(jié)果表明：在1 650 ℃燒結(jié)24 h可以獲得單相樣品，Zn2+在B位的固溶度為3%~5%，樣品的相對(duì)密度為92.3%。Ca、Zn雙摻雜能大大提高樣品的電導(dǎo)性能，800 ℃時(shí)總電導(dǎo)率為0.39 S/m，ln(sT)與1/T關(guān)系曲線(xiàn)呈一折線(xiàn)，高溫電導(dǎo)活化能小于低溫電導(dǎo)活化能，710 ℃以上的電導(dǎo)活化能為0.66 eV，710 ℃以下的電導(dǎo)活化能為1.18 eV。
關(guān)鍵字: 氧離子導(dǎo)電性；雙摻雜鋁酸釤；交流阻抗譜；電導(dǎo)率
SmAlO3-based oxygen ionic conductor
（School of Mathematics and Physics, Jiangsu University of Science and Technology, Zhenjiang 212003, China）
Abstract: A series of samples Sm0.9Ca0.1Al1-xZnxO3-δ(x=0, 0.03, 0.05) were synthesized by solid state reaction method. The microstructure, morphology and sinterability of the samples were characterized by X-ray diffraction and scanning electron microscope. And the alternating current impedance measurements were performed at 500−1 000 ℃. The results show that the single phase samples can be obtained when the samples are sintered at 1 650 ℃ for 24 h, and the solid solubility of Zn2+ on B site should be in the range of 3%−5%, and the relative density of Sm0.9Ca0.1Al0.97Zn0.03O3−δ is 92.3%. The doubly doping of Ca and Zn can improve consumedly the electrical properties of SmAlO3, and the total conductivity of Sm0.9Ca0.1Al0.97Zn0.03O3−δ is 0.39 S/m at 800 ℃. The curves of ln(σT) against 1/T reveal two straight lines intersecting at 710 ℃. The activation energy of oxygen-vacancy motion above 710 ℃ is lower than that below 710 ℃.
Key words: oxygen ionic conduction; doubly doped SmAlO3; alternating current impendence spectrum; conductivity
