Abstract

REYES, David; GOMEZ, María E; LOPEZ, Marta  and  PRIETO, Pedro. Resistividad eléctrica en función de la temperatura para la aleación Cu₉₀Co₅Ni₅ sintetizada por aleado mecánico. Rev. LatinAm. Metal. Mater. [online]. 2010, vol.30, n.2, pp.136-140. ISSN 0255-6952.

The development of magnetic nanocrystalline alloys has received increasing attention in the electronic devices industry. One of these materials is the Cu-Co-Ni alloy, which shows a coexistence of magnetic and electric properties, it has the necessary ductility to made pieces whit complex shapes for functional and structural applications. In this work we report on the electrical properties of the Cu₉₀Co₅Ni₅ alloy produced by mechanical alloying. Alloys were prepared by the milling method using a planetary-balls mill, with milling times of 30h, 45h y 60h. Alloy powders were cold-compacted and then sintered. The electrical characterization was carried out through resistivity measurements using a standard fourprobe technique in a physical properties measure system (PPMS) by Quantum Design^®. The resistivity was obtained in the temperature range of 5-300K and was fitted by the Bloch-Grüneisen model. From the fit the Debye temperature (θ) was obtained for each sample. The lower Debye temperature was obtained for the 60h-milling time Cu-Co-Ni sample, θ=273K. Comparing whit the Cu₉₀Co₁₀ alloy, θ also decrease due to presence of Ni. The 60h-milling time Cu-Co-Ni sample also shows a increase of the residual tension above 21,5% and could be associate to the decrease of the Debye temperature.

Keywords : Cu-Co-Ni Alloys; mechanical alloy; Transport properties.