uranium dioxide

…material shown is urania (uranium dioxide, UO₂). In this structure the oxygen anions are bonded to only four cations. Oxides with this structure are well known for the ease with which oxygen vacancies can be formed. In zirconia (zirconium dioxide, ZrO₂), which also possesses this structure, a great number…

…consisting of pellets of sintered uranium dioxide loaded into cladding tubes of zirconium alloy or some other advanced cladding material. The tubes, called pins or rods, measure approximately 1 cm (less than half an inch) in diameter and roughly 3 to 4 metres (10 to 13 feet) in length. The…

…prepared for the LWR is uranium dioxide. Produced in the form of a ceramic powder, this compound is ground to a very fine flourlike consistency and inserted into a die, where it is pressed into a pellet shape—in the case of some LWR fuels, approximately 6 mm in diameter and…

Urania (uranium dioxide, UO₂) and plutonia (plutonium dioxide, PuO₂) have unique features that qualify them for nuclear fuel applications. First, they are extremely refractory: for instance, the melting point of UO₂ is in excess of 2,800° C (5,100° F). Second, the open crystal structure of oxide…

…occurs in the form of uranium dioxide, which—owing to oxidation—can vary in exact chemical composition from UO₂ to UO_2.67. Other uranium ores of economic importance are autunite, a hydrated calcium uranyl phosphate; tobernite, a hydrated copper uranyl phosphate; coffinite, a black hydrated uranium silicate; and carnotite, a yellow hydrated potassium…