期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 179, 期 2, 页码 500-511出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2005.11.013
关键词
Sr3Co2O5+delta; oxygen deficient Ruddlesden-Popper phase; magnetic properties
The reduced Ruddlesden-Popper phases, Sr3Co2O5 + delta with delta = 0.91, 0.64 and 0.38, have been prepared in a nitrogen atmosphere. The crystal structures were determined by powder neutron diffraction. Oxygen vacancies are found both in O(3) and O(4) sites but the majority are along one crystallographic axis in the CoO2 plane, inducing an orthorhombic distortion of the normally tetragonal n = 2 Ruddelsden-Popper structure. Superstructures due to oxygen ordering are observed by electron microscopy. The magnetic measurements reveal complex behavior with some ferromagnetic interactions present for Sr3Co2O5.91 and Sr3Co2O5.64. (C) 2005 Elsevier Inc. All rights reserved.
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