Publicação: Influence of current density on crystalline structure and magnetic properties of electrodeposited Co-rich CoNiW alloys
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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.
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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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Materials Chemistry and Physics, v. 141, n. 1, p. 576-581, 2013.
