Berlin 2012 – scientific programme
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DS: Fachverband Dünne Schichten
DS 30: Thin film characterization: structure analysis and composition (TEM, LEED, PAS)
DS 30.2: Talk
Thursday, March 29, 2012, 09:45–10:00, H 0111
Structural investigations of ferecrystals [(SnSe)1+x]m[TaSe2]1 by transmission electron microscopy — •Corinna Grosse1, Ryan Atkins2, Holm Kirmse1, Wolfgang Neumann2, and David C. Johnson2 — 1AG TEM, Humboldt-Universität zu Berlin, 10099 Berlin, Germany — 2Department of Chemistry, University of Oregon, Eugene OR 97401-3753, USA
Ferecrystals are a new kind of layered materials with an unusual, turbostratically disordered structure. Layered materials can have structural and physical properties which differ from those of bulk compounds. Structural investigations of the materials are necessary to gain an insight into the mechanisms which can influence their physical properties. The new family of ferecrystals [(SnSe)1+x]m[TaSe2]1 with m = 1, 3, and 6 was investigated by various methods of transmission and scanning transmission electron microscopy (TEM/STEM), including selected area electron diffraction (SAED) and energy-dispersive X-ray spectroscopy (EDXS). The high-resolution TEM and STEM images show in-plane crystallinity, atomically abrupt interfaces and turbostratic disorder in the [(SnSe)1+x]m[TaSe2]1 ferecrystals. Certain layer-to-layer orientations appear prevalently, suggesting local ordering between the different types of layers in parts of the ferecrystals. The SAED patterns show an increase in ordering with increasing index m. The chemical composition of the layers was determined by means of EDXS.