Browsing by Author "Giachini, L"

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    Structural studies of the phases in Ba2LaIrO6 - new light on an old problem
    (Elsevier, 2009-11) Zhou, Q; Kennedy, BJ; Avdeev, M; Giachini, L; Kimpton, JA
    Accurate and precise structures for the cation-ordered double perovskite Ba2LaIrO6 at a number of temperatures are presented. Careful analysis of the synchrotron X-ray and neutron diffraction profiles of Ba2LaIrO6 suggests that, at room temperature, this is monoclinic in space group I2/m. Heating the sample to 375 K results in a transition to a rhombohedral phase in R3¯ with further heating resulting in the loss of the tilting of the octahedra, the structure being in Fm3¯m. Cooling the sample induces an additional phase transition to a triclinic structure in I1¯. Details of the various structures are presented. © 2009, Elsevier Ltd.