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Structure and microstructure of the high pressure synthesised misfit layer compound [Sr2O2][CrO2]1.85



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Castillo Martínez, Elizabeth y Schönleber, Andreas y Smaalen, Sander van y Arévalo López, Ángel M. y Alario Franco , Miguel Ángel (2008) Structure and microstructure of the high pressure synthesised misfit layer compound [Sr2O2][CrO2]1.85. Journal of Solid State Chemistry, 181 . pp. 1840-1847. ISSN 0022-4596

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URL Oficial: http://www.sciencedirect.com/science/journal/00224596


The strontium chromium oxide [Sr2O2][CrO2]1.85 misfit layer compound has been synthesised at high pressure and high-temperature conditions. Electron diffraction patterns and high-resolution transmission electron microscopy images along [001] show the misfit character of the different layers composing the structure with a supercell along the incommensurate parameter b=7b1=13b2. The modulated
crystal structure has been refined within the superspace formalism against single-crystal X-ray diffraction data, employing the (3+1)-dimensional superspace group Cnmb(0s20)0 0 s. The compound has a composite structure with lattice parameters a1=5.182(1)A˚ , b1=5.411(1)A˚ , c1=18.194(3)A˚ for the first, SrO, subsystem and the same a and c, but with b2=2.925(1)A˚ for the second, CrO2, subsystem. The layer stacking is similar to that of orthorhombic PbS(TiS2)1.18, but with a much stronger
intersubsytem bonding in the case of the oxide. The intersubsystem lattice mismatch is mainly handled by displacement modulations of the Sr atoms, correlated with modulations of the valence, the coordination and the anisotropic displacement parameters.

Tipo de documento:Artículo
Palabras clave:misfit layer compounds, crystallography, high pressure
Materias:Ciencias > Química > Cristalografía
Ciencias > Química > Química inorgánica
Código ID:8827
Depositado:14 Aug 2009 11:38
Última Modificación:03 Sep 2010 08:03

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