Low Temperature Molten Salt Synthesis of Perovskite-type ACeO3（A=Sr, Ba） in Eutectic NaCl-KCl  

作　　者：LIU Ming HU Lei XU Pengfei ZHAO Kun ZONG Lingbo YU Ranbo CHEN Jun 

机构地区：[1]Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, P.R.China

出　　处：《Chemical Research in Chinese Universities》2015年第3期342-346,共5页高等学校化学研究（英文版）

基　　金：the National Natural Science Foundation of China（Nos.51472025, 21271021）.

摘　　要：A molten salt method was developed for the synthesis of ACeO3（A=Sr, Ba） with perovskite structure at 750 ℃（SrCeO3） and 850 ℃（BaCeO3） in the eutectic NaCl-KCl. The synthetic temperature was much lower than that of the conventional method（generally〉1000 ℃）. The structure and morphology of the product were characterized by means of X-ray diffraction（XRD）, field emission scanning electron microscopy（FESEM） and transmission electron microscopy（TEM）. The results show that the synthesized octahedral SrCeO3 crystallizes in the orthorhombic system with the unit cell parameters of a=0.85855 nm, b=0.61523 nm, c=0.60059 nm, and the synthesized cuboid BaCeO3 crystallizes in the cubic system with the unit cell parameter of a=0.43962 nm. The result of X-ray photoelectron spectroscopy（XPS） analysis indicates that both Ce4＋ and Ce3＋ exist in the two structures, and the Ce4＋/Ce3＋ peak area ratios for SrCeO3 and BaCeO3 are 1.93 and 2.12, respectively. Meanwhile, the adsorbed/lattice oxygen ratios（1.87 for SrCeO3 and 3.04 for BaCeO3） indicate the existence of a lot of oxygen vacancies in the structures of SrCeO3 and BaCeO3, which indicates a far-reaching significance to study the corresponding physicochemistry performance.A molten salt method was developed for the synthesis of ACeO3（A=Sr, Ba） with perovskite structure at 750 ℃（SrCeO3） and 850 ℃（BaCeO3） in the eutectic NaCl-KCl. The synthetic temperature was much lower than that of the conventional method（generally〉1000 ℃）. The structure and morphology of the product were characterized by means of X-ray diffraction（XRD）, field emission scanning electron microscopy（FESEM） and transmission electron microscopy（TEM）. The results show that the synthesized octahedral SrCeO3 crystallizes in the orthorhombic system with the unit cell parameters of a=0.85855 nm, b=0.61523 nm, c=0.60059 nm, and the synthesized cuboid BaCeO3 crystallizes in the cubic system with the unit cell parameter of a=0.43962 nm. The result of X-ray photoelectron spectroscopy（XPS） analysis indicates that both Ce4＋ and Ce3＋ exist in the two structures, and the Ce4＋/Ce3＋ peak area ratios for SrCeO3 and BaCeO3 are 1.93 and 2.12, respectively. Meanwhile, the adsorbed/lattice oxygen ratios（1.87 for SrCeO3 and 3.04 for BaCeO3） indicate the existence of a lot of oxygen vacancies in the structures of SrCeO3 and BaCeO3, which indicates a far-reaching significance to study the corresponding physicochemistry performance.

关 键 词：Molten salt synthesis PEROVSKITE SrCeO3 BACEO3 

分 类 号：O645.4[理学—物理化学] TQ127.2[理学—化学]