Journal of Solid State Electrochemistry

, Volume 16, Issue 2, pp 715–722

Anomalous codeposition of cobalt and ruthenium from chloride–sulfate baths

Authors

  • Marjaneh Jafari Fesharaki
    • Research Institute for Solid State Physics and OpticsHungarian Academy of Sciences
    • Department of Physics, Faculty of ScienceUniversity of Arak
  • Gholam Reza Nabiyouni
    • Department of Physics, Faculty of ScienceUniversity of Arak
  • Júlia Dégi
    • Research Institute for Solid State Physics and OpticsHungarian Academy of Sciences
  • Lajos Pogány
    • Research Institute for Solid State Physics and OpticsHungarian Academy of Sciences
  • Ádám Révész
    • Department of Materials PhysicsEötvös University
  • Imre Bakonyi
    • Research Institute for Solid State Physics and OpticsHungarian Academy of Sciences
    • Research Institute for Solid State Physics and OpticsHungarian Academy of Sciences
Original Paper

DOI: 10.1007/s10008-011-1416-6

Cite this article as:
Jafari Fesharaki, M., Nabiyouni, G.R., Dégi, J. et al. J Solid State Electrochem (2012) 16: 715. doi:10.1007/s10008-011-1416-6

Abstract

Codeposition of Ru and Co was studied at room temperature and at 50 °C with various Ru3+ and Co2+ concentrations in the electrolyte. The codeposition of Co and Ru proved to be anomalous since no pure Ru could be obtained in the presence of Co2+ in the electrolyte, but a significant Co incorporation into the deposit was detected at potentials where the deposition of pure Co was not possible. The composition of the deposits varied monotonously with the change of the concentration ratio of Co2+ and Ru3+. The deposition of Ru was much hindered, and the current efficiency was a few percent only when the molar fraction of Co in the deposit was low. Continuous deposits could be obtained only when the molar fraction of Co in the deposit was at least 40 at.%. The deposit morphology was related to the molar fraction of Co in the deposit. The X-ray diffractograms are in conformity with a hexagonal close-packed alloy and indicate the formation of nanocrystalline deposits. Two-pulse plating did not lead to a multilayer but to a Co-rich alloy. Magnetoresistance of the samples decreased with increasing Ru content.

Keywords

RutheniumCobaltAnomalous codepositionAlloy formationPulse plating

Copyright information

© Springer-Verlag 2011