کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1329214 | 978894 | 2009 | 6 صفحه PDF | دانلود رایگان |
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.
Text3Variable temperature neutron and synchrotron X-ray powder diffraction methods have been used to resolve the long standing question regarding the symmetry and structure of the cation-ordered perovskite Ba2LaIrO6. We show this is monoclinic in I2/m at room temperature, with the sequence of phases I1¯→I2/m→R3¯→Fm3¯m.Figure optionsDownload as PowerPoint slide
Journal: Journal of Solid State Chemistry - Volume 182, Issue 11, November 2009, Pages 3195–3200