Low temperature molten salt synthesis of perovskite-type ACeO3(A=Sr, Ba) in eutectic NaCl-KCl

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• 作者：Ming Liu ; Lei Hu ; Pengfei Xu ; Kun Zhao…
• 关键词：Molten salt synthesis ; Perovskite ; SrCeO3 ; BaCeO3
• 刊名：Chemical Research in Chinese Universities
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：31
• 期：3
• 页码：342-346
• 全文大小：736 KB
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• 作者单位：Ming Liu (1)
  Lei Hu (1)
  Pengfei Xu (1)
  Kun Zhao (1)
  Lingbo Zong (1)
  Ranbo Yu (1)
  Jun Chen (1)
  Xianran Xing (1)
  
  1. Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, P. R. China
  
• 刊物主题：Chemistry/Food Science, general; Analytical Chemistry; Inorganic Chemistry; Organic Chemistry; Physical Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：2210-3171

文摘

A molten salt method was developed for the synthesis of ACeO3(A=Sr, Ba) with perovskite structure at 750 °C(SrCeO3) and 850 °C(BaCeO3) in the eutectic NaCl-KCl. The synthetic temperature was much lower than that of the conventional method(generally>1000 °C). 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.