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Researchers from University of Witwatersrand Report Findings in Materials Science (In situ powder XRD and Mossbauer study of Fe-Co supported on CaCO3)

August 5, 2014

By a News Reporter-Staff News Editor at Journal of Technology -- Researchers detail new data in Materials Science. According to news originating from Johannesburg, South Africa, by VerticalNews correspondents, research stated, "The phase behaviour of Fe and Co particles, supported on CaCO3 was studied using mainly in situ PXRD and Mossbauer spectroscopy. This is of interest as these systems can be used as catalysts to produce multi-walled carbon nanotubes (MWCNTs) following appropriate heat treatment and reduction."

Our news journalists obtained a quote from the research from the University of Witwatersrand, "The Fe-Co/CaCO3 samples were prepared by deposition of the metallic particles from solution onto the support. The study indicated that the CaCO3 support reacted in air or N-2 with the iron and cobalt present in all three samples studied (10% Fe/CaCO3, 10% Co/CaCO3 and 10% Fe-Co/CaCO3) to give a brownmillerite structure with the general formula Ca2M2O5 (M = Fe, Co or Fe + Co). Reduction of the bimetallic catalyst gave Fe2Co alloy and Co. This confirms earlier reports by other authors that implicated this alloy as the active phase in the synthesis of the MWCNTs."

According to the news editors, the research concluded: "The bimetallic catalyst was easier to reduce than the monometallic catalysts."

For more information on this research see: In situ powder XRD and Mossbauer study of Fe-Co supported on CaCO3. Materials Research Bulletin, 2014;56():98-106. Materials Research Bulletin can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England. (Elsevier -; Materials Research Bulletin -

The news correspondents report that additional information may be obtained from N. Chiwaye, University of Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa. Additional authors for this research include L.L. Jewell, D.G. Billing, D. Naidoo, M. Ncube and N.J. Coville.

Keywords for this news article include: Johannesburg, South Africa, Materials Science

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Source: Journal of Technology

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