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Phase Structure and Magnetic Properties of Intermetallic Cu-Ni Alloy Nanopowders Synthesized by the Electrical Explosion of Wire

Nguyen Minh-Thuyet, Kim Jin-Chun

Archives of Metallurgy and Materials

2019

Vol. 64, iss. 3

893--898

Cu-Ni composite nanoparticles were successfully synthesized by electrical explosion of wire (EEW) method. Cu-Ni alloy and twisted wires with various Ni contents were used as the feeding material for a 3 kV charging voltage EEW machine in an ethanol ambient chamber. The phase structure and magnetic properties of the as-fabricated samples were studied. It was established that the prepared powders after drying have a spherical form with the particle size is under 100 nm. XRD analysis indicated that the nanopowders consisted of binary Cu-Ni phases. Only pure phases of the intermetallic compound Cu-Ni (Cu0.81Ni0.19 and Cu3.8Ni) were observed in the XRD patterns of the samples. The synthesized intermetallic Cu-Ni alloy nanopowders reveal magnetic behaviors, however, the lower Ni content samples exhibited paramagnetic behaviors, meanwhile, the higher Ni content samples exposed ferromagnetic properties.

Characterization of Cu-Ni alloys by temperature-programmed reduction method

Zieliński J.

Polish Journal of Chemistry

1998

Vol. 72, nr 12

2621-2628

Reduction of surface oxide preformed on unsupported and alumina supported Cu-Ni alloys was examined at a linearly increasing temperature. The obtained TPR spectra exhibited two peaks of H2 consumption, connected with the reduction of surface copper and surface nickel oxides. The size of these peaks was used to estimate surface compositions of the alloy. The results obtained agree with the surface composition calculated from a semiempirical equation.