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Characteristics of electrochemically obtained Ni96.7Mo3.3 alloy powder

L. RIBIĆ-ZELENOVIĆ1, M. SPASOJEVIĆ1, A. MARIČIĆ1,* , M.RISTIĆ2

Affiliation

  1. Joint Laboratory for Advanced Materials of Serbian Academy of Science and Arts, Section for Amorphous Systems, Svetog Save 65, 32000 Cacak, Serbia
  2. Serbian Academy of Science and Arts Belgrade, Serbia

Abstract

Nickel molybdenum alloy powder was obtained by electrochemical deposition of a solution of 0.035 mol dm-3 NiSO4·7H2O; 0.007 mol dm-3 Na2MoO4·2H2O; 0.007 mol dm-3 NaCl and 0.7 mol dm-3NH4OH on a titanium cathode with a current density of j=100 mA cm-2. X-ray analysis established that the powder consisted of 20% amorphous and 80% crystalline teseral phase of a solid solution of the Ni96.7Mo3.3 alloy. The amorphous phase forms a matrix hosting FCC phase nanocrystals with an average dimension of 18 nm. It was established that molybdenum atoms increase the minimal density of randomly distributed dislocations and mean microstrain values and impede formation of new nucleuses and thus accelerate formation of the alloys’ amorphous phase. Powder particles were not spherical but elongated. The maximal particle length varied between 7 and 30 μm, while the minimal was between 3.5 and 17 μm. SEM micrographs show two particle shapes: larger particles with a cauliflower shape and smaller particles with a dendrite shape. Based on EDS spectra it was established that cauliflower shaped particles contained on average 30% more molybdenum than dendrite shaped particles. X-ray photoelectron spectroscopy showed that the chemical composition of the surface particle layer differed from the bulk particle composition. The surface layer consisted of adsorbed water molecules. OH groups are below this layer followed by Ni2O3 oxides and MoO3..

Keywords

Amorphous powder, Nickel and molybdenum alloy, Nanocrystals, Dendrites.

Submitted at: Dec. 21, 2007
Accepted at: June 9, 2008

Citation

L. RIBIĆ-ZELENOVIĆ, M. SPASOJEVIĆ, A. MARIČIĆ, M.RISTIĆ, Characteristics of electrochemically obtained Ni96.7Mo3.3 alloy powder, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 6, pp. 1384-1389 (2008)