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

Abstract

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.

Keywords

Molten salt synthesis / Perovskite / SrCeO₃ / BaCeO₃

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