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O: Fachverband Oberflächenphysik

O 91: [MA] Poster II

O 91.12: Poster

Freitag, 30. März 2012, 11:00–14:00, Poster A

Elastic properties and stability of Heusler compounds — •S. -C. Wu^1,2, S. S. Naghavi¹, G. H. Fecher^1,2, and C. Felser^1,2 — 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 A_e>1. Zener’s ratios of the most stable compounds are in the range of 1.9<A_e<2.7. A_e<0 is not stable and A_e=0 is isotropic. More physical properties could be derived from the calculated elastic constants.