Ceria reduction under hydrogen leads to a fluorite lattice expansion between 573 and 1073 K. Both bulk reduction of Ce4+ ions and insertion of hydrogen are thought to be responsible for this expansion in the 573–843 K temperature range.
C. Lamonier, G. Wrobel and J. P. Bonnelle, J. Mater. Chem., 1994, 4, 1927 DOI: 10.1039/JM9940401927
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