Ce_2Zr_2O_<7+x>における酸素の吸収挙動とCe_2Zr_2O_<7.5>相の生成

概要

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Oxygen absorption behavior of Ce_2Zr_20_<7+x> (0≦x≦1) with an ordered arrangement of Ce and Zr ions was studied by X-ray powder diffraction, electron diffraction and thermogravimetric analysis. It is revealed that the oxygen absorption of Ce_2Zr_20_7 during heating in oxygen proceeds mainly through two reactions: (1) reaction from Ce_2Zr_2O_7 to Ce_2Zr_2O_<7.5> around 400 K and (2) reaction from Ce_2Zr_20_<7.5> to Ce_2Zr_2O_8 around 600 K.This behavior suggests the presence of the intermediate phase of the composition, Ce_2Zr_2O_<7.5>. The intermediate phase, Ce_2Zr_20_<7.5>, was found to give extra reflections compared with Ce_2Zr_20_7, and to belong to space group F43m. This intermediate phase was obtained by oxidation of Ce_2Zr_20_7 at room temperature for about 1 year, or heating at 473K or lower temperature in oxygen.
社団法人日本セラミックス協会の論文
2003-06-01