Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 91: [MA] Poster II
O 91.12: Poster
Friday, March 30, 2012, 11:00–14:00, Poster A
Elastic properties and stability of Heusler compounds — •S. -C. Wu1,2, S. S. Naghavi1, G. H. Fecher1,2, and C. Felser1,2 — 1Institute of Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg - University, Mainz — 2Max Planck Institute for Chemical Physics of Solids, Dresden
The properties of Heusler compounds which are the promising thermoelectric materials are important. Various Heusler compounds are investigated with respect to their malleability and stability. By applying isotropic strain in different ways to the cubic crystal could calculate the elastic constants. The result of the cubic elastic anisotropy can be used to decide the structural stability. The behavior that Young’s modulus is largest in the <111>-type directions whereas the rigidity modulus is largest in the <100>-type directions shows a direct consequence of Ae>1. Zener’s ratios of the most stable compounds are in the range of 1.9<Ae<2.7. Ae<0 is not stable and Ae=0 is isotropic. More physical properties could be derived from the calculated elastic constants.