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Synthesis of CeO_2-ZrO_2 Solid Solutions by Hydrolysis

机译:水解法合成CeO_2-ZrO_2固溶体

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摘要

Ceria-zirconia (CeO_2-ZrO_2) solid solutions were prepared from acidic aqueous solutions of ZrOCl_2 and Ce (SO_4)_2 centre dot 2 (NH_4)_2SO_4 by hydrolysis under a hydrothermal condition. The morphology, crystallite size, lattice parameter, and lattice strain of the solid solutions changed depending on the composition of the CeO_2-ZrO_2 system. Spherical agglomeration of primary particles was one of the distinctive morphological features of solid solution precipitates with cubic and/or tetragonal fluorite structure, their agglomeration size ranging from 50 to 500 nm, depending on composition. With increasing ZrO_2 content, the lattice parameter of the solid solutions decreased and the crystallite size (i.e., primary particle size) of the solid solutions also decreased from 22 to 14 nm. The morphology and crystalline phase of directly formed precipitates in the CeO_2-ZrO_2 system were greatly influenced by the nature of anion constituent of cerium and zirconium salts.
机译:通过在水热条件下水解,由ZrOCl_2和Ce(SO_4)_2中心点2(NH_4)_2SO_4的酸性水溶液制备二氧化铈-氧化锆(CeO_2-ZrO_2)固溶体。固溶体的形态,微晶尺寸,晶格参数和晶格应变根据CeO_2-ZrO_2系统的组成而变化。一次颗粒的球形团聚是具有立方和/或四方萤石结构的固溶体沉淀物的独特形态特征之一,其团聚大小在50至500 nm之间,具体取决于组成。随着ZrO 2含量的增加,固溶体的晶格参数降低,并且固溶体的微晶尺寸(即,初级粒径)也从22nm降低至14nm。 CeO_2-ZrO_2系统中直接形成的沉淀物的形态和结晶相受铈盐和锆盐阴离子组成的性质的影响很大。

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