Superconductivity in Amorphous and Fully Crystallized Ni-Fe-Zr Metallic Glasses

F. Hamed^1,

¹Department of physics, Faculty of Science, United Arab Emirates University, Al-Ain, UAE

Cite this paper:
F. Hamed. Superconductivity in Amorphous and Fully Crystallized Ni-Fe-Zr Metallic Glasses. American Journal of Materials Science and Engineering. 2013; 1(2):24-28. doi: 10.12691/ajmse-1-2-2

Abstract

Nano crystallization of Ni_0.5Fe_0.5Zr₃ metallic glasses was achieved by isothermal annealing over the temperature range 673-1173K. The crystallization precedes with the formation of metastable fcc (FeZr₂+NiZr₂) + stable bct (FeZr₂+NiZr₂) to stable bct (FeZr₂+NiZr₂). The resistivity (ρ) of the amorphous and fully crystallized states of Ni_0.5Fe_0.5Zr₃ metallic glasses was investigated over the temperature range 2-300k. The temperature dependence of the resistivity (ρ(T)) for the amorphous state is well described by the Mizutani's equation as group 4 metallic glasses with the Fermi level in the d band; while ρ(T) for the fully crystallized states show a negative deviation from linearity. The amorphous and crystalline states have displayed superconductive transitions at low temperatures. Enhancement in the superconducting transition temperature (T_c) in comparison to the amorphous state was observed in the fully crystallized states.

Keywords:
metallic glasses crystallization nano crystallization electrical transport

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