Some optical properties of intrinsic and doped UO2 thin films

Ultrafast Photoemission Spectroscopy of the Uranium DioxideUO2Mott Insulator: Evidence for a Robust Energy Gap Structure

“…The threshold fluences of 1.25 and 0.22 mJ=cm 2 determined from Fig. 3 at 3.1-and 4.65-eV excitation energies, respectively, correspond to an absorbed fluence threshold F th , of 0.02 eV per U atom taking into account optical absorption at 3.1 (0.007 nm −1 ) and 4.65 eV (0.01 nm −1 ) photon energies [21]. The nonlinear fluence dependence of τ 1 for the 3.1-and 4.65-eV cases suggests that high-order processes begin to dominate in this regime.…”

First-principles study of the electronic structure and optical properties of UO2

“…This instability in uranium thin films has led to increased interest in uranium oxide thin films because of their stability and high reflectivity in some region of wavelength [2,3]. Experimentally, the optical properties of uranium-based mirrors have been studied since the early 1990s by different research teams [2][3][4][5][6][7][8][9][10][11]. However, at present there is no theoretical report about optical properties of the bulk UO 2 .…”

Chemical Vapor Deposition of Phase‐Pure Uranium Dioxide Thin Films from Uranium(IV) Amidate Precursors

“…[1] Defect formation and void swelling in UO 2 fuel pellets dramatically reduce the lifetime and energy output of these materials,b ut the direct study of the surface oxidation processes that cause these defects can be challenging due to the chemical complexity and extreme radioactivity of spent fuels. [1][2][3] Due to their large active surface areas,phase-pure UO 2 thin films can serve as an excellent model systems for the chemical and physical changes that occur at the grain boundaries of bulk UO 2 fuel pellets.U ranium oxide thin films have been fabricated using both solution [4][5][6] and sputtering [7][8][9][10] methods;h owever,a chieving stoichiometric control in the resulting films has been challenging due to the wide array of accessible uranium oxide phases and the facile interconversion of these phases at grain boundaries. [5,11] Consequently,m any published studies on uranium oxide have been performed using materials with avarying degree of amorphous or polycrystalline character.…”

“…Thee xperimentally detected overall weight losses of 7 (65.0 %) and 8 Scheme 1. Synthesis of the crowned potassiumamidates K(ITA)(18c6) (5)and K(TTA)(18c6) (6).…”