Determination of the local configuration of interacting defects in a crystalline, periodic solid is problematic because defects typically do not have a long-range periodicity. Uranium dioxide, the primary fuel for fission reactors, exists in hyperstoichiometric form, UO(2+x). Those excess oxygen atoms occur as interstitial defects, and these defects are not random but rather partially ordered. ...

Antarctic ice-core data reveal that the atmosphere experienced abrupt centennial increases in CO2 concentration during the last deglaciation (~18 thousand to 11 thousand years ago). Establishing the role of ocean circulation in these changes requires high-resolution, accurately dated marine records. Here, we report radiocarbon data from uranium-thorium-dated deep-sea corals in the Equatorial At...

Abstract Actinide materials exhibit strong spin–lattice coupling and electronic correlations, are predicted to host new emerging ground states. One example is piezomagnetism magneto-elastic memory effect in the antiferromagnetic Mott-Hubbard insulator uranium dioxide, though its microscopic nature under debate. Here, we report X-ray diffraction studies of oriented dioxide crystals pulsed magnet...

The mechanical behaviour of UO2 single crystal is under debate due to the unexpected multi-slip observations in experiments that involve dislocations 12〈110〉{100} slip systems but also 12〈110〉{110} and 12〈110〉{111}. We propose a multi-scale model based on composite which, effect cross-slip, part dislocation density primary can be transferred secondary with lower propensity glide more favourable...

Uranium dioxide (UO2) is the primary fuel material that used in current nuclear reactors. As one of most fundamental parameters, grain boundary (GB) energy strongly influences many properties, and depend on characters properties individual GBs. Using molecular dynamics simulations, a high throughput survey GB UO2 was carried out for purpose elucidating roles geometry such as misorientation incl...