NaCa4Nb5O17: a layered perovskite AnBnO3n+2 compound
Language
en
Article de revue
This item was published in
Acta Crystallographica Section C : Crystal Structure Communications [1968-2013]. 2003, vol. 59, n° 2, p. i18-i20
International Union of Crystallography
English Abstract
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 ...Read more >
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.Read less <
English Keywords
NaCa4Nb5O17
Crystal structure
Crystallography
Origin
Hal imported