Anisotropy in the thermal expansion of uranium silicide measured by neutron diffraction

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Date
2018-09
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
In-situ neutron diffraction patterns were collected for a sample of as-cast U3Si2 during heating to 1600 °C. Anomalous changes were observed above 1000 °C, including the formation of a new diffraction peak not belonging to P4/mbm U3Si2, unequal changes in the peak intensities and onset of anisotropic lattice expansion. The large data-set enabled derivation of a function-fitted isotropic thermal expansion coefficient to high precision, in close agreement with previous dilatometry results but reducing linearly with temperature over the studied interval. Anisotropy in the instantaneous lattice thermal expansion corresponded to anomalies reported by White et al. (2015) at a similar temperature. © Elsevier B.V
Description
Keywords
Accident-tolerant nuclear fuels, Thermal expansion, Uranium, Silicides, Phase transformations
Citation
Obbard, E. G., Johnson, K. D., Burr, P. A., Lopes, D. A., Gregg, D. J., Liss, K. D., Griffiths, G., Scales., & Middleburgh, S. C. (2018). Anisotropy in the thermal expansion of uranium silicide measured by neutron diffraction. Journal of Nuclear Materials, 508, 516-520. doi:10.1016/j.jnucmat.2018.04.049