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Pretty vacant: The excellent oxygen storage capacity (OSC) of κ-Ce2Zr2O8 (see picture; Ce gray, Zr green, O red) is shown to be a result of its unique structural features; after removing oxygen atoms, the structural relaxation is local (vacancy shown in brown), and both the localized structural relaxation and the number of localized structural relaxations are maximized.
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Wang et al. (2009) studied this question.
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