Strategies To Stabilize New Oxides in the Sr n +1 (CoTa) n O 3 n +1 Ruddlesden–Popper Homologous Series

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 homo...

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Bibliographic Details
Published in:Chemistry : a European journal 2007-01, Vol.13 (3), p.910-915
Main Authors: Boulahya, Khalid, Parras, Marina, González‐Calbet, José María
Format: Article
Language:English
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Summary: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.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.200600882