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Relaxation process of a Willis 2:2:2 cluster (a) to a split interstitial (b). Each cube indicates an oxygen cage and the arrows point to the atomic relaxation directions. In (a), the top interstitial moves to annihilate the nearest vacancy , and the two interstitials relax downwards to their nearby sites.
Defect concentrations of point oxygen interstitial, uranium vacancy, COT-o, and clusters at . All other components are negligible.
Pseudophase diagram of oxygen interstitials in , where the hatched area marks the region in which the neutron diffraction measurements had been performed.
First-principles results for oxygen defect clusters in : is the defect induced volume change per fluorite cubic cell; , , and are the overall defect formation energy, formation energy per excess oxygen, and formation energy per oxygen Frenkel pair, respectively.
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