NaCa4Nb5O17: a layered perovskiteAnBnO3n+2compound
| Autor: | F. J. Zuniga, J. Darriet |
|---|---|
| Přispěvatelé: | Institut de Cristallographie, Université de Lausanne (UNIL), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB) |
| Rok vydání: | 2003 |
| Předmět: |
010302 applied physics
NaCa4Nb5O17 Crystallography Chemistry Crystal structure [CHIM.MATE]Chemical Sciences/Material chemistry 02 engineering and technology General Medicine 021001 nanoscience & nanotechnology Block (periodic table) 01 natural sciences General Biochemistry Genetics and Molecular Biology Octahedron 0103 physical sciences Ion distribution Lamellar structure 0210 nano-technology Perovskite (structure) Natural bond orbital |
| Zdroj: | Acta Crystallographica Section C: Crystal Structure Communications Acta Crystallographica Section C: Crystal Structure Communications, International Union of Crystallography, 2003, 59 (2), pp.i18-i20. ⟨10.1107/S0108270102022746⟩ |
| ISSN: | 0108-2701 |
| DOI: | 10.1107/s0108270102022746 |
| Popis: | International audience; Sodium tetracalcium pentaniobium heptadecaoxide, NaCa4Nb5O17, corresponds to the n = 5 term of the homologous AnBnO3n+2 family of structures composed of ABX3 perovskite layers. The structure consists of perovskite-type blocks of n = 5 layers of NbO6 octahedra, separated by an interblock region. Successive blocks along the b axis are displaced by {1 \over 2}c with respect to each other. The deformation of the NbO6 octahedra is a minimum at the middle of each block, and increases along the direction of the b axis to a maximum at each end of the block. Ca and Na share the same intrablock sites, coordinated by 12 O atoms, whereas only Ca atoms are found in the interblock cavities, at sites with different coordination geometries. |
| Databáze: | OpenAIRE |
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