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A wide variety of compositions adopt the isometric spinel structure (AB O ), in which the atomic-scale ordering is conventionally described according to only three structural degrees of freedom. One, the inversion parameter, is traditionally defined as the degree of cation exchange between the A- and B-sites. This exchange, a measure of intrinsic disorder, is fundamental to understanding the variation in the physical properties of different spinel compositions.
Neutron total scattering was used to investigate defect accumulation mechanisms in CeO and ThO irradiated with 2.2 GeV Au ions. Pair distribution function (PDF) analysis was applied to characterize the local structural evolution and irradiation-induced defects as a function of irradiation fluence. CeO exhibits a greater amount of disorder than ThO under the same irradiation conditions.
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