Bulletin of Materials Science

, Volume 24, Issue 5, pp 515–521

Submicron particles of Co, Ni and Co-Ni alloys

Authors

  • P. Saravanan
    • Chemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research
  • T. A. Jose
    • Chemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research
  • P. John Thomas
    • Chemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research
  • G. U. Kulkarni
    • Chemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research
Article

DOI: 10.1007/BF02706724

Cite this article as:
Saravanan, P., Jose, T.A., Thomas, P.J. et al. Bull Mater Sci (2001) 24: 515. doi:10.1007/BF02706724

Abstract

Magnetic sub-micron sized particles (with diameters in the range 100–600 nm) of Co, Ni and Co-Ni alloys, protected with polyvinylpyrrolidone have been prepared in gram quantities using the polyol process. Experiments carried out with different metal precursors and starting compositions have yielded reliable routes to produce particles of the desired diameters in the 100–600 nm range. The particles were characterized with X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, thermogravimetric analysis and magnetic measurements. The particles are found to be stable under ambient conditions indefinitely. The coercivity values of the Co and Ni particles are ∼50% higher compared to the corresponding bulk values. The alloy particles follow a trend similar to the bulk alloys.

Keywords

Submicron particlesCoNiCo-Ni alloys

Copyright information

© Indian Academy of Sciences 2001