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A TEM and XRD study of the SbNbSe3 misfit layer structures
Salmanca Oviedo LN1, Gomez-Herrero, Landa Canovas AR
1Dpto. Inorganica, Fac. C.C. Quimicas, Universidad Complutense, Madrid, Spain.
Micron (Oxford, England : 1993)
|June 1, 2000
Summary
Two new misfit layer structures, (SbSe)1+delta (NbSe2), were synthesized and characterized. These structures feature a modulated composite of SbSe and NbSe2 layers, differing in the symmetry of the SbSe layer.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- Misfit layer compounds are known for their unique structural and electronic properties.
- The Sb-Nb-Se system offers potential for novel material discovery.
Purpose of the Study:
- To synthesize and characterize new misfit layer structures in the Sb-Nb-Se system.
- To elucidate the structural details and symmetry of these novel phases.
Main Methods:
- Synthesis of new misfit layer compounds.
- Powder X-ray diffraction for structural refinement.
- Transmission Electron Microscopy (TEM), including electron diffraction, High-Resolution Electron Microscopy (HREM), and Energy-Dispersive X-ray Spectroscopy (XEDS) for structural determination.
Main Results:
- Two new monolayer misfit layer structures of the type (SbSe)1+delta (NbSe2) were identified.
- The structures exhibit a modulated composite of pseudotetragonal SbSe (Q) and pseudohexagonal NbSe2 (H) layers.
- The two phases differ in the symmetry of the Q layers: orthorhombic (delta = 0.17) and monoclinic (delta = 0.19).
- Incommensurate modulation along the 'a' direction was observed due to the misfit between the Q and H layers.
Conclusions:
- The study successfully synthesized and characterized two novel misfit layer compounds in the Sb-Nb-Se system.
- Detailed structural analysis revealed distinct orthorhombic and monoclinic symmetries in the SbSe layers, leading to unique modulated structures.
- These findings expand the understanding of misfit layer compounds and their structural diversity.