Synthesis of nano-crystalline spherical cobalt-iron (Co-Fe) alloy particles by ultrasonic spray pyrolysis and hydrogen reduction

Sebahattin Gurmen*, Aybars Guven, Burcak Ebin, Srecko Stopić, Bernd Friedrich

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

Spherical nano-crystalline Co-Fe particles were produced by ultrasonic spray pyrolysis (USP) of aqueous solutions of cobalt-iron chloride followed by thermal decomposition of generated aerosols in hydrogen atmosphere. The effect of the precursor solution in the range of 0.05 M, 0.1 M, 0.2 M and 0.4 M on the morphology and crystallite size of the Co-Fe alloy particles are investigated under the conditions of 1.5 h running time, 800 °C reduction temperature, and 1.0 l/min H2 volumetric flow rate. X-ray diffraction (XRD) studies and Scherer crystallite size calculations show that the crystallite size varies between 25 nm and 27 nm. Scanning electron microscopy (SEM) observations reveal that the the precursor solution strongly influences the particle size of the synthesized Co-Fe alloy particles. Energy dispersive spectroscopy (EDS) results indicate that particles consist of iron and cobalt. Spherical nano-crystalline Co-Fe alloy particles in the range of 100-920 nm were obtained at 800 °C.

Original languageEnglish
Pages (from-to)600-604
Number of pages5
JournalJournal of Alloys and Compounds
Volume481
Issue number1-2
DOIs
Publication statusPublished - 29 Jul 2009

Keywords

  • Co-Fe
  • Metals and alloys
  • Nanostructured materials
  • Ultrasonic spray pyrolysis

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