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Anisotropic Transport Properties of the Al13TM4 and T-Al-Mn-Fe Complex Metallic Alloys

Anisotropic transport properties (electrical resistivity, ρ(T), thermoelectric power, S(T), and thermal conductivity k(T)) of the Al76Co22Ni2 (Y-phase Al-Ni-Co), o-Al13Co4 and T-Al72.5Mn21.5Fe6 complex metallic alloys has been investigated in wide temperature range 2-300 K. The investigated compounds belong to the class of decagonal approximant phases with stacked-layer crystallographic structure and enabled us to study the evolution of transport properties with increasing structural complexity and the unit cell size. For the Y-Al-Ni-Co and o-Al13Co4, the anisotropic electronic transport coefficients can be reproduced theoretically by an ab-initio calculation using Boltzmann transport theory and the calculated anisotropic Fermi surface. Non-metallic anisotropic electrical resistivity of T-Al72.5Mn21.5Fe6 can be analyzed in a semi-quantitative way by using the theory of quantum transport of slow charge carriers.

complex metallic alloys; electrical resistivity; thermal transport; anisotropy; thermopower; approximants

Rad je pod naslovom "Anisotropic transport properties of Complex Metallic Alloys" Ana Smontara prezentirala kao pozvano predavanje na skupu 11th International conference on quasicrystals (ICQ11), održanom od 13.-18.06.2010.g., Sapporo, Japan ; S.I.: Proceedings of the Eleventh International Conference on Quasicrystals, 13-18 June 2010, Sapporo, Japan.