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Strategies To Stabilize New Oxides in the Sr n +1 (CoTa) n O 3 n +1 Ruddlesden–Popper Homologous Series
Author(s) -
Boulahya Khalid,
Parras Marina,
GonzálezCalbet José María
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200600882
Subject(s) - homologous series , octahedron , crystallite , crystallography , perovskite (structure) , series (stratigraphy) , chemistry , diffraction , electron diffraction , materials science , crystal structure , physics , optics , geology , paleontology
Two new oxides of the Ruddlesden–Popper series have been isolated and structurally characterized in the Sr‐Co‐Ta‐O system. X‐ray and electron diffraction and high‐resolution electron microscopy show that polycrystalline Sr 3 CoTaO 7 constitutes the n =2 member of a new Sr n +1 (CoTa) n O 3 n +1 homologous series, the essential feature of which is the existence of two connected Co/Ta octahedral layers, separated by Sr atoms. Sr 2 CoTaO 6 , the n =∞ member of the series, shows a particular short‐range ordering of Co and Ta at the octahedral sites leading, as shown by high‐resolution electron microscopy, to the disordered intergrowth of simple and double perovskite type domains. Strategies to stabilize new oxides of this series are discussed.