ZÚÑIGA, Francisco Javier; DARRIET, Jacques

doi:10.1107/S0108270102022746

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ZÚÑIGA, Francisco Javier
Institut de Cristallographie

DARRIET, Jacques
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Acta Crystallographica Section C : Crystal Structure Communications [1968-2013]. 2003, vol. 59, n° 2, p. i18-i20

International Union of Crystallography

Résumé en anglais

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.< Réduire

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NaCa4Nb5O17

Crystal structure

Crystallography

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NaCa4Nb5O17: a layered perovskite AnBnO3n+2 compound

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