RT Journal Article
T1 Structure and microstructure of the high pressure synthesised misfit layer compound [Sr2O2][CrO2]1.85
A1 Castillo Martínez, Elisabet
A1 Schönleber, Andreas
A1 Smaalen, Sander van
A1 Arévalo López, Ángel M.
A1 Alario Franco, Miguel Ángel
AB 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 modulatedcrystal 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 strongerintersubsytem 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.
PB Elsevier
SN 0022-4596
YR 2008
FD 2008
LK https://hdl.handle.net/20.500.14352/53019
UL https://hdl.handle.net/20.500.14352/53019
LA spa
DS Docta Complutense
RD 17 abr 2025