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

E. G. Obbard*, K. D. Johnson, P. A. Burr, D. A. Lopes, D. J. Gregg, K. D. Liss, G. Griffiths, N. Scales, S. C. Middleburgh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


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.

Original languageEnglish
Pages (from-to)516-520
Number of pages5
JournalJournal of Nuclear Materials
StatePublished - Sep 2018
Externally publishedYes


  • Accident tolerant fuel
  • In-situ neutron diffraction
  • Phase transformation
  • Thermal expansion
  • Uranium silicide


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