Title

Band-to-band Transitions and Critical Points in the Near-infrared to Vacuum Ultraviolet Dielectric Functions of Single Crystal Urania and Thoria

Authors

Alyssa Mock
Christina L. Dugan
Sean Knight
Rafał Korlacki
J. Matthew Mann
Martin M. Kimani
James C. Petrosky, Air Force Institute of TechnologyFollow
Peter A. Dowben, University of Nebraska - Lincoln
Mathias Schubert

Document Type

Article

Publication Date

5-2019

Abstract

Band-to-band transition energy parameters for single-crystal actinide samples of uranium oxide and thorium oxide were determined and compared using spectroscopic ellipsometry and critical-point dielectric function analyses. Spectroscopic ellipsometry measurements from the near-infrared to the vacuum ultraviolet spectral region were used to determine the dielectric functions of uranium oxide and thorium oxide. The critical-point structure is similar between UO₂ and ThO₂ but strongly blue shifted for ThO₂. We find bandgap energies of 2.1 eV and 5.4 eV for UO₂ and ThO₂, respectively.

Comments

© 2019 Authors

In accordance with AIP policies, a 12-month embargo was observed for posting this article, https://publishing.aip.org/resources/researchers/rights-and-permissions/sharing-content-online/

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in volume 114 of Applied Physics Letters and may be found at https://doi.org/10.1063/1.5087059.

DOI

10.1063/1.5087059

Source Publication

Applied Physics Letters

Recommended Citation

A. Mock, C.L. Dugan, S. Knight, R. Korlacki, J.M. Mann, M.M. Kimani, J.C. Petrosky, P.A. Dowben, and M. Schubert, Appl. Phys. Lett. 114, 211901 (2019). https://doi.org/10.1063/1.5087059