University of SaskatchewanHARVEST
  • Login
  • Submit Your Work
  • About
    • About HARVEST
    • Guidelines
    • Browse
      • All of HARVEST
      • Communities & Collections
      • By Issue Date
      • Authors
      • Titles
      • Subjects
      • This Collection
      • By Issue Date
      • Authors
      • Titles
      • Subjects
    • My Account
      • Login
      JavaScript is disabled for your browser. Some features of this site may not work without it.
      View Item 
      • HARVEST
      • College of Arts & Science
      • Chemistry
      • View Item
      • HARVEST
      • College of Arts & Science
      • Chemistry
      • View Item

      Assessing the oxidation states and structural stability of the Ce analogue of brannerite

      Thumbnail
      View/Open
      assessing the oxidation states and structural stability of the Ce analogue of brannerite.pdf (3.602Mb)
      Date
      2017
      Author
      Aluri, Esther Rani
      Bachiu, Lisa
      Grosvenor, Andrew
      Forbes, Scott
      Greedan, John
      Publisher
      Wiley
      Type
      Article
      Metadata
      Show full item record
      Abstract
      The Ce‐containing analogue of brannerite (ie, UTi2O6) was previously considered to be stoichio- metric (ie, CeTi2O6); however, it has recently been determined that the material is O deficient. This oxygen‐deficient material has been suggested to be charged balanced by the presence of a minor concentration of Ce3+ or by the A‐site being cation deficient with the Ce oxidation state being 4+. A variety of Ti‐containing oxides (including brannerite) have been investigated as potential nuclear wasteforms, and it is necessary to understand the electronic structure of a proposed nuclear wasteform material as well as how the structure responds to radiation from incorporated waste elements. The radiation resistance of a material can be simulated by ion implantation. The objective of this study was to confirm the Ce oxidation state in the cation‐ and oxygen‐deficient material (ie, Ce0.94Ti2O6 − δ) and to determine how radiation damage affects this material. X‐ray photoelectron spectroscopy (XPS) and X‐ray absorption near‐edge spectros- copy were used to study Ce0.94Ti2O6 − δ before and after being implanted with 2 MeV Au− ions. Analysis of the Ce 3d XPS spectra from the as‐synthesized samples by using a previously developed fitting method has unequivocally shown that Ce adopts both 4+ (major) and 3+ (minor) oxidation states, which was confirmed by examination of magnetic susceptibility data. Analysis of XPS and X‐ray absorption near‐edge spectroscopy spectra from ion‐implanted materials showed that both Ce and Ti were reduced because of radiation damage and that the local coordination environments of the cations are greatly affected by radiation damage.
      Citation
      Surf Interface Anal. 2017;49:1335–1344.
      URI
      http://hdl.handle.net/10388/8559
      Subject
      brannerite
      ion implantation
      magnetic susceptibility
      nuclear wasteform,
      XANES
      XPS
      XRD
      Collections
      • Chemistry
      University of Saskatchewan

      University Library

      © University of Saskatchewan
      Contact Us | Disclaimer | Privacy