Fig. 32: Thermal variation of the -6, 0, 6 lattice spacing of EuAs3. The evolution for higher temperatures originates from phonon processes whereas the anomalous expansion below the phase transitions at 11 K and 10.3 K is related to magnetic ordering. The latter is obtained by the sublattice magnetisation measured by the integrated reflectivity of the non-resonant magnetic 1, 0, 5/2 Bragg reflection shown as an inset.