The Debye Temperature of a Single Crystal Thorium–Uranium Dioxide Alloy. Issue 12 (13th November 2018)

• Record Type: Journal Article
• Authors: Dugan, Christina L.; Young, Christopher; Carmona, Rodney; Schneider, Mitchell; Petrosky, James C.; Mann&, James; Hunt, Eric; McClory, John W.
• Is Part Of: Physica status solidi. Volume 12:Issue 12(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-11-13
• Subjects: Debye temperature -- photoemission spectroscopy -- thorium dioxide -- uranium dioxide; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.201800436
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : The effective Debye temperature( Θ DE ) of the surface of a single crystal of U0.71 Th0.79 O2 alloy prepared by hydrothermal synthesis is obtained from temperature‐dependent X‐ray photoemission in the temperature range of 300–623 K. The effective average Debye temperature is determined to be 217 ± 24 K. X‐ray fluorescence (XRF) spectroscopy confirms the crystal's composition as U0.71 Th0.79 O2 . Photoemission spectroscopy reveals both thorium and uranium 4f states, which includes uranium and thorium in 4+ oxidation states. The Debye temperature of the single crystal U0.71 Th0.79 O2 alloy, as measured via photoemission, is lower than urania or thoria literature values, indicating either higher defect scattering or the presence of added vibrational modes within the alloyed sample. Abstract : The effective Debye temperature of a single crystal of Ux Th1−x O2 alloy measures at 217 ± 24 K. X‐ray fluorescence spectroscopy confirms the crystal's composition as U0.71 Th0.79 O2 . The Debye temperature of the single crystal U0.71 Th0.79 O2 alloy, as measured via photoemission, is lower than UO2 or ThO2 literature values, indicating either higher defect scattering or the presence of added vibrational modes.