Figure 1
From: Lattice disorder effect on magnetic ordering of iron arsenides

Data on EuFe2As2 ‘crystal a’ and ‘crystal b’. (a) Specific heat, C(T), results with transitions associated with Eu (TN = 21 K) and Fe ordering (TN = 195 K or 175 K). (b) Precession images showing the [HK0] and [H0L] reciprocal lattice planes reconstructed from single crystal X-ray diffraction patterns measured at room temperature. Smearing in diffraction spots are more prevalent in ‘crystal a,’ noted in [H0L] plane.