The fcc-hcp phase transition in electrodeposited epitaxial cobalt films

✍ Scribed by H.L. Gaigher; N.G. van der Berg

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 789 KB
• Volume: 21
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(76)85108-0

✦ Synopsis

Thin (50-500 A) films of cobalt were electrodeposited from sulphate solutions having pH values in the range 1 .9-5 onto thin (001) single-crystal copper substrates . Bicrystals and stripped deposits were examined by transmission electron microscopy and electron diffraction . Deposits from solutions with 45 gIl boric acid were essentially fcc for all pH values . Stacking faults, associated with imperfect misfit dislocations, converted only a very small fraction of the fcc cobalt into the hcp structure . Deposits from lightly-buffered (6 g) I boric acid) solutions contained small crystallites of hop cobalt provided the solution pH z 3 . Growth of the hcp phase is probably associated with the presence of colloidal hydroxide at the cathode surface .