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Area of Science:

  • Geochemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Technetium (Tc) is a long-lived radionuclide of concern in nuclear waste.
  • Iron oxides, such as hematite (alpha-Fe2O3), are common environmental minerals.
  • Understanding Tc incorporation into iron oxides is crucial for predicting its environmental fate.

Purpose of the Study:

  • To investigate the structural mechanisms and energetic feasibility of Tc incorporation into hematite.
  • To determine the preferred oxidation state and site for Tc within the hematite lattice.
  • To provide insights for the spectroscopic identification of incorporated Tc species.

Main Methods:

  • Quantum-mechanical calculations using periodic supercell models.
  • Energy calculations for Tc4+ and pertechnetate (TcO4-) incorporation.
  • Evaluation of Tc substitution on the metal sublattice and interstitial insertion.

Main Results:

  • Pertechnetate (TcO4-) incorporation into hematite is energetically unfavorable.
  • Incorporation of Tc4+ is feasible, with a minimum of 2.6 wt % possible.
  • Tc4+ and Fe2+ ions exhibit a preference for clustering in the hematite lattice.
  • Minimized bond distances for Tc4+ impurities were calculated.

Conclusions:

  • Tc4+ incorporation into hematite is energetically feasible under specific conditions.
  • The clustering of Tc4+ and Fe2+ is driven by reduced Coulombic repulsion.
  • These findings align with observations of Tc association with iron oxides in nuclear waste environments.
  • Prior reduction of TcO4- to Tc4+ is key for Tc incorporation into iron oxides and (oxy)hydroxides.