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Correlation between the electron state density and the electrical resistivity in the nanostructured powder of the Ni-Mo alloy

L. RIBIĆ-ZELENOVIĆ1,* , L. RAFAILOVIĆ1, A. MARIČIĆ1, M. SPASOJEVIĆ1

Affiliation

  1. Joint Laboratory for Advanced Materials of SASA, Section for Amorphous Systems, Technical Faculty Čačak, Svetog Save 65, 32 000 Čačak, Serbia

Abstract

The nanostructured powders of the Ni95.4Mo4.6 and Ni99Mo1 alloys were obtained by the electrochemical deposition from ammonium solutions of nickel and molybdenum salts. The differential scanning calorimetry DSC and measurements of the temperature dependence of the electrical resistivity, magnetic permeability and the thermoelectromotive force were used to examine the structural changes of the powders. The nanocrystalline alloys Ni95.4Mo4.6 and Ni99Mo1 were stable up to about 460 K. The thermal stabilization of the alloys take place within the temperature interval of 460 K to 570 K resulting in a decrease in electrical resistivity and increases in magnetic permeability as well as electron state density in the proximity of the Fermi level. The crystallization temperature was dependent upon the current density of powder formation. The nanocrystalline alloy Ni95.4Mo4.6 obtained at j = 70 mA.cm-2 was crystallized within the temperature interval of 650 K to 840 K, and the Ni99Mo1 alloy was obtained at j = 180 mA cm-2 in the 580 K – 950 K interval. The crystallization of the nanocrystalline alloy brought about decreases in the electrical resistivity and magnetic permeability and an increase in the electron state density near the Fermi level. The electrical resistivity decrease recorded during the structural changes is due to an increase in the electron state density in the proximity of the Fermi level as well as to an increase in the mean free path of conduction electrons..

Keywords

Nanostructured alloy, Electron density of states, Electrical properties, Thermal properties, Magnetic measurements.

Submitted at: Feb. 26, 2007
Accepted at: Sept. 18, 2007

Citation

L. RIBIĆ-ZELENOVIĆ, L. RAFAILOVIĆ, A. MARIČIĆ, M. SPASOJEVIĆ, Correlation between the electron state density and the electrical resistivity in the nanostructured powder of the Ni-Mo alloy, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 9, pp. 2681-2685 (2007)