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Influence of current density on crystalline structure and magnetic properties of electrodeposited Co-rich CoNiW alloys
  • Universidade Estadual Paulista (UNESP)
  • Universidade Federal do Espírito Santo (UFES)
  • Universidade de São Paulo (USP)
The influence of current density, at the interval 5-100 mA cm-2, on the structural and magnetic properties of electrodeposited (Co 100-xNix)100-yWy alloys (x = 23-33.5 at. % Ni, y = 1.7-7.3 at. % W) was studied from a glycine-containing bath. W-content decreases with the increase of the current density magnitude. X-ray data have shown stabilization of hexagonal close packed, face centered cubic or a mixture of these structures by modulating the applied cathodic current density, for values lower than 50 mA cm-2. Two structural phase transitions were observed: one from hexagonal close packed to face centered cubic structural transition occurring for a current density of 20 mA cm -2, and another one, from cubic crystalline phase to amorphous state, which happens for values higher than 50 mA cm-2. These structural phase transitions seem to be associated with the W-content as well as average crystalline grain sizes that reduce with increasing the current density value. The grain size effect may explain the face centered cubic stabilization in Co-rich CoNiW alloys, which was initially assumed to be basically due to H-adsorption/incorporation. Magnetic properties of Co-rich CoNiW alloys are strongly modified by the current density value; as a result of the changes on the W-content and their structural properties© 2013 Elsevier B.V. All rights reserved.
Issue Date: 
Materials Chemistry and Physics, v. 141, n. 1, p. 576-581, 2013.
Time Duration: 
  • Alloys
  • Chemical synthesis
  • Electron microscopy
  • Magnetic materials
  • Magnetic properties
  • Cathodic current density
  • Crystalline grain size
  • Crystalline structure
  • Face-centered cubic
  • Hexagonal close packed
  • Structural and magnetic properties
  • Structural phase transition
  • Structural transitions
  • Alloying
  • Amino acids
  • Cerium alloys
  • Crystalline materials
  • Electrodeposition
  • Grain size and shape
  • Nickel
  • Stabilization
  • Synthesis (chemical)
  • Current density
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