On the Chemistry of Bismuth-based Layered Metal-Insulator Hybrids: Bismuth Iodides and Bismuth Telluroiodides
Event details
| Date | 11.10.2013 |
| Hour | 14:15 |
| Speaker | Dr. Anna Isaeva, Professur Anorganische Chemie II, Technische Universität Dresden |
| Location | |
| Category | Conferences - Seminars |
The present contribution reports some highlights of the research on bismuth-rich compounds performed at the Inorganic Chemistry Department of TU Dresden with a special focus on Bi14Rh3I9 [1,2] and Bi2TeI [3] that have been recognized in our group (in cooperation with the Leibniz Institute IFW Dresden) as 3D weak topological insulators.
Our special interest to bismuth is propelled by its abilities to act as an electron donor as well as an acceptor and to demonstrate a fine interplay of electron localization vs. delocalization in contact with electron acceptors of various strength. This underlines abundant crystal chemistry of bismuth, e. g. in so called metal–insulator hybrids that can be synthesized by partial oxidation of bismuth intermetallic compounds with halogens (Cl, Br, I). The resultant strongly anisotropic compounds can be insulating along selected crystallographic directions with spin-orbit coupling on bismuth affecting the states around the band gap.
We apply a broad spectrum of synthetic techniques ranging from conventional high-temperature annealing and chemical-transport reactions to novel ionic-liquid-based synthesis at room temperatures. For the exhaustive characterization of our samples X-ray powder and single-crystal diffractometry complemented with electron microscopy investigations (ED, HRTEM, STEM), elemental composition analysis (EDX, WDX) and thermodynamical stability studies are conducted.
References:
[1] B. Rasche, A. Isaeva, M. Ruck, S. Borisenko, V. Zabolotnyy, B. Büchner, K. Koepernik, C. Ortix, M. Richter, J. van den Brink. Nature Mater. 2013, 12, 422;
[2] B. Rasche, A. Isaeva, W. Van den Broek, M. Kaiser, A. Gerisch, U. Kaiser, Ch. Koch, M. Ruck. Chem. Mater. 2013, 25, 2359.
[3] A. Isaeva, A 2D TI in various crystal-chemical surroundings: a study on the bismuth bilayer, New Trends in Topological Insulators, Sant Feliu de Guixols, Barcelona, Spain, June 3−6 2013.
Our special interest to bismuth is propelled by its abilities to act as an electron donor as well as an acceptor and to demonstrate a fine interplay of electron localization vs. delocalization in contact with electron acceptors of various strength. This underlines abundant crystal chemistry of bismuth, e. g. in so called metal–insulator hybrids that can be synthesized by partial oxidation of bismuth intermetallic compounds with halogens (Cl, Br, I). The resultant strongly anisotropic compounds can be insulating along selected crystallographic directions with spin-orbit coupling on bismuth affecting the states around the band gap.
We apply a broad spectrum of synthetic techniques ranging from conventional high-temperature annealing and chemical-transport reactions to novel ionic-liquid-based synthesis at room temperatures. For the exhaustive characterization of our samples X-ray powder and single-crystal diffractometry complemented with electron microscopy investigations (ED, HRTEM, STEM), elemental composition analysis (EDX, WDX) and thermodynamical stability studies are conducted.
References:
[1] B. Rasche, A. Isaeva, M. Ruck, S. Borisenko, V. Zabolotnyy, B. Büchner, K. Koepernik, C. Ortix, M. Richter, J. van den Brink. Nature Mater. 2013, 12, 422;
[2] B. Rasche, A. Isaeva, W. Van den Broek, M. Kaiser, A. Gerisch, U. Kaiser, Ch. Koch, M. Ruck. Chem. Mater. 2013, 25, 2359.
[3] A. Isaeva, A 2D TI in various crystal-chemical surroundings: a study on the bismuth bilayer, New Trends in Topological Insulators, Sant Feliu de Guixols, Barcelona, Spain, June 3−6 2013.
Practical information
- Informed public
- Free
Organizer
- ICMP (Arnaud Magrez and Raphael Butté)
Contact
- Arnaud Magrez