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Triclinic and monoclinic structures of SrLaCuNbO 6 and SrLaCuTaO 6 double perovskites
Author(s) -
West D. Vincent,
Davies Peter K.
Publication year - 2011
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889811012131
Subject(s) - triclinic crystal system , monoclinic crystal system , crystallography , synchrotron , crystal structure , neutron diffraction , materials science , powder diffraction , diffraction , chemistry , optics , physics
SrLaCuNbO 6 and SrLaCuTaO 6 are Jahn–Teller distorted double perovskites with complete B ‐site ordering. The crystal structure of SrLaCuTaO 6 has been solved by refinement of neutron powder diffraction data at 323 (triclinic), 573 (monoclinic) and 923 K (body‐centered monoclinic). Synchrotron X‐ray and electron diffraction reveal local‐scale features similar to those seen in ferroelectric perovskites, and also in A ‐site ordered perovskites exhibiting nanoscale periodicities. The crystal structure of SrLaCuNbO 6 was solved by refinement of synchrotron X‐ray powder diffraction data at 673 and 1273 K. Because of the high resolution of the synchrotron, adjustments to these structure models were necessary in order to account for profile irregularities resulting from the local‐scale behavior.