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

doi:10.1007/s40242-015-4330-0

Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (3): 342-346.doi: 10.1007/s40242-015-4330-0

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

LIU Ming, HU Lei, XU Pengfei, ZHAO Kun, ZONG Lingbo, YU Ranbo, CHEN Jun, XING Xianran

Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, P. R. China

Received:2014-09-03 Revised:2014-10-23 Online:2015-06-01 Published:2014-11-24
Contact: YU Ranbo E-mail:ranboyu@ustb.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.51472025, 21271021).

Abstract

Abstract:

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.

Key words: Molten salt synthesis, Perovskite, SrCeO₃, BaCeO₃

LIU Ming, HU Lei, XU Pengfei, ZHAO Kun, ZONG Lingbo, YU Ranbo, CHEN Jun, XING Xianran. Low Temperature Molten Salt Synthesis of Perovskite-type ACeO₃(A=Sr, Ba) in Eutectic NaCl-KCl[J]. Chemical Research in Chinese Universities, 2015, 31(3): 342-346.

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

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