“…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 .…”