Abstract
The structures of eight members of the series Sr 1− x Ce x MnO 3 with 0.075⩽ x⩽0.4 have been established using synchrotron X-ray powder diffraction. These exhibit the sequence of structures cubic Pm 3 ¯ m ⟶ x ≈ 0.08 tetragonal I 4 / mcm ⟶ x ≈ 0.35 orthorhombic Imma with increasing Ce content. Unusual peak broadening due to domain wall scattering is observed near the composition-induced first-order cubic–tetragonal transition. The temperature dependence of the structures for three examples x=0.1, 0.2 and 0.35 is described. For the x=0.1 and 0.35 samples evidence for a first-order loss of the orbital ordering associated with a cooperative Jahn–Teller distortion is presented. The onset of the orbitally disordered state is accompanied by a discontinuous reduction in cell volume.
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