Fig. 8: Thermal expansion of cubic and tetragonal unit cells.
From: Thermal expansion and degradation of uranium mononitride under high-temperature oxidative conditions

Comparison of molar volume (m3/mol) of the UN phase extracted from XRD data, modeled as either a cubic phase (black) and a hypothetical tetragonal unit cell (purple), alongside the superimposed unit cells; the black arrow shows the direction of anisotropic expansion.