No abstract

In this work, the magnetic Cu x Ni 1-x alloy nanoparticles were obtained from DCSs by a chemical reduction method. In this method magnetic Cu x Ni 1-x alloy nanoparticles were prepared from [Cu(NH 3 ) 4 ][Ni(C 2 O 4 ) 2 ], [Cu(en) 2 ][Ni(C 2 O 4 ) 2 ] and [Cu(py) 4 ][Ni(C 2 O 4 ) 2 ]coordination complexes. Reduction of these complexes was occurred in ethanolic aqueous solution by hydrazine monohydrate. In order to characterization the synthesized compounds, we have used, IR spectroscopy, EDX, SEM and XRD. The magnetic properties of nanoalloys were measured using a Vibrating Sample Magnetometer (VSM). Magnetoimpedance (MI) measurements were performed 10 using a Lock-in Amplifier (7265 Perkin Elmer) at the frequency of 250 kHz. These alloys demonstrate ferromagnetic behaviour which is due to presence of nickel in the alloys. This property makes them as an excellent candidate for technological applications such as magnetic devices or sensors based on MI effect. The powder x-ray diffraction patterns were analyzed by Rietveld method. The analyses carried out with the GSAS software package. The results of the Rietveld refinements show a good agreement between the observed pattern and the calculated values.

Magnetic Cu-Co alloy nanoparticles have been prepared by a chemical reduction method of double complex salts (DCSs). In this method Cu-Co alloy nanoparticles have been prepared from [Co(NH 3 ) 6 ] 2 [Cu(C 2 O 4 ) 2 ] 3 (DCS1), [Co(NH 3 ) 5 Cl][Cu(C 2 O 4 ) 2 ] (DCS2) and [Co(en) 3 ] 2 [Cu(C 2 O 4 ) 2 ] 3 (DCS3) coordination complexes. Reduction of these complexes occurred in ethanolic aqueous solution by hydrazine monohydrate. In order to characterize the synthesized compounds we have used XRD, EDX, SEM and IR spectroscopy. Magneticproperties and giant magnetoimpedance are investigated in Cu-Co nanoalloys. These alloys demonstrate ferromagnetic behavior, which is due to presence of Co in the alloys. This property makes them an excellent candidate for technological applications such as magnetic devices or sensors based on a magnetoimpedance effect. The relative phase abundances of Cu and Co were carried out with the GSAS software. The results of the Rietveld refinements show a good agreement between the observed pattern and the calculated values.