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U1.33T4Al8Si2 (T = Ni, Co): Complex Uranium Silicides Grown from Aluminum/Gallium Flux Mixtures

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journal contribution
posted on 27.08.2019, 17:35 by Ashini S. Jayasinghe, You Lai, Ryan Baumbach, Susan E. Latturner
Two new quaternary analogs of the Gd1+xFe4Si10‑y structure type were grown from the reaction of uranium, silicon, and a transition metal (nickel or cobalt) in an excess of aluminum/gallium flux. The use of a mixed flux was found to be necessary for the formation of U1.33T4Al8Si2 (T = Ni, Co). Single crystal X-ray diffraction data shows the presence of disordered U/Si layers that are characteristic of this structure type; precession photographs indicate partial formation of a superstructure and stacking disorder along the c-axis. This disorder may be the cause of the spin glass behavior that is particularly evident in the nickel analog, which exhibits a spin freezing transition at TF = 7 K. These compounds are resistant to chemical attack and oxidation and may be potential waste forms.