Crystal Structure and Phase Relationships in the Reduced-Reoxidized Ceria-Zirconia Solid Solution

Tsuyoshi Sasaki; Yoshio Ukyo; Kotaro Kuroda; Shigeo Arai; Hiroyasu Saka

doi:10.4028/www.scientific.net/MSF.475-479.1351

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HomeMaterials Science ForumMaterials Science Forum Vols. 475-479Crystal Structure and Phase Relationships in the...

Crystal Structure and Phase Relationships in the Reduced-Reoxidized Ceria-Zirconia Solid Solution

Abstract:

The crystal structures of reduced-reoxidized ceria-zirconia solid solutions, Ce2Zr2O7+x, with an ordered arrangement of Ce and Zr ions were studied by transmission electron microscopy (TEM), X-ray powder diffraction and thermogravimetric analysis. The oxygen absorption of Ce2Zr2O7 with pyrochlore structure (space group m Fd 3 ) was revealed to proceed through two-step reaction; reaction from Ce2Zr2O7 to b-Ce2Zr2O7.5 around 400K and reaction from b-Ce2Zr2O7.5 to Ce2Zr2O8 about 600K. b-Ce2Zr2O7.5 phase with space group m F 3 4 was thought to be formed by occupation of the half ordered oxygen vacancies with oxygen ions periodically. The oxidation from Ce2Zr2O7 to b-Ce2Zr2O7.5 was also occurred at room temperature by keeping for about 1 year or by irradiation of an electron beam in TEM. On the other hand, the crystal structure of Ce2Zr2O8, completely oxidized state of Ce2Zr2O7, belongs to the space group of m P 3 4 or 23 P from the rule for possible diffractions and the symmetry of the ordering cations.

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Materials Science Forum (Volumes 475-479)

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1351-1354

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https://doi.org/10.4028/www.scientific.net/MSF.475-479.1351

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Online since:

January 2005

Authors:

Tsuyoshi Sasaki, Yoshio Ukyo, Kotaro Kuroda, Shigeo Arai, Hiroyasu Saka

Keywords:

Ceria-Zirconia Solid Solution, Crystal Structure, Ordered Arrangement, Oxidation, Reduction

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