The innovation engine for new materials

Borides with extraordinary properties

Seminar Group: 


Dr. Barbara Albert


Eduard-­‐Zintl-­‐Institute of Inorganic and Physical Chemistry
Technische Universität Darmstadt, Germany


Thursday, August 13, 2015 - 1:30pm


MRL Room 2053


Prof. Ram Seshadri

Metal borides1 are inorganic solids that often show refractory properties, like super-­hardness2 and very high-­melting points. They may also prove to be exciting concerning their electronic structure, as  shown for super-‐conducting magnesium diboride,  MgB2,3 or samarium hexaboride,  SmB6,4 which was recently described to be a topological insulator.

New investigations on nanoscale and bulk mono‐, di-tetra-­, and hexaborides will be  presented. Examples  are  MnB4,  crystallizing  similar  to  hypothetical  tetragonal  diamond  but  exhibiting  an unexpected Peierls distortion,5,6 solid solutions of (M,M')B6 with good  thermoelectric  properties,7 and nanoscale metal borides that can be (ferro)magnetic.8 Synthesis,  characterization, structures, and properties will be discussed. 


1 B. Albert, H. Hillebrecht, Angew. Chem. Int. Ed. 48 (2009) 8640‐8668 

2 R. Mohammadi, A.T. Lech, M. Xie, B. E. Weaver, M. T. Yeung, S. H. Tolbert, R. B. Kaner, PNAS 108

  (2011) 10958‐10962 

3 J. Nagamatsu, N. Nakagawa,T. Muranaka, J. Akimitsu,Y. Zenitani, Nature (2001) 63-­64 

4 D. J. Kim, J. Xia, Z. Fisk, Nature Materials 13 (2014) 466‐470

5 A. Knappschneider, C. Litterscheid, N.C. George, J. Brgoch, N. Wagner, J. Beck. J.A. Kurzman, R.  

  Seshadri, B. Albert, Angew. Chem. 126 (2014) 1710-­1714, Int. Ed. Engl. 53 (2014) 1684-­1688

6 A. Knappschneider, C. Litterscheid, J. Brgoch, N. C. George, S. Henke, A. K. Cheetham, J. G. Hu, R. 

  Seshadri, B. Albert, Chem. Eur. J. 21 (2015), 8177-­8181 

7 M. Gürsoy, M. Takeda, and B. Albert, J. Solid State Chem. 221 (2015) 191-­195

8 S. Rades, S. Kraemer, R. Seshadri, B. Albert, Chem. Mater. (2014) 1549-­1552