Hostname: page-component-78c5997874-v9fdk Total loading time: 0 Render date: 2024-11-05T15:18:17.454Z Has data issue: false hasContentIssue false
  • English
  • Français

Powder diffraction data and Rietveld refinement of Hägg-carbide, χ-Fe5C2

Published online by Cambridge University Press:  10 January 2013

Johannes J. Retief
Johannes J. Retief
Affiliation:
Sasol Technology (Pty) Ltd., Research and Development Division, P.O. Box 1, 9570 Sasolburg, Free State, Republic of South Africa
Get access Rights & Permissions [Opens in a new window]

Abstract

The structure and powder diffraction data of Hägg-carbide (χ-Fe5C2) have been redetermined and improved by X-ray diffraction. Experimental values of 2θ, corrected for systematic errors, relative peak intensities, lattice spacings, and the Miller indices of 27 observed reflections up to 100° 2θ are reported. The unit cell is monoclinic (space group C2/c, Z=4) with a=11.588 Å, b=4.579 Å, c=5.059 Å, and β=97.75°. The crystal structure has been refined by Rietveld analysis, resulting in Rwp=0.073.

Keywords

Hägg-carbidestructureRietveld refinementpowder data
Type
Research Article
Information
Powder Diffraction , Volume 14 , Issue 2 , June 1999 , pp. 130 - 132
Copyright
Copyright © Cambridge University Press 1999

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Dirand, M., and Afqir, L. (1983). “Identification structurale précise des carbures précipités dans les aciers faiblement allies aux divers stades du revenu. Mécanismes de precipitation,” Acta Metall. 31, 1089–1107.CrossRefGoogle Scholar
Dry, M. (1981). The Fischer Tropsch Synthesis, edited by J. R. Anderson and M. Boudart (Springer, Berlin, New York), Vol. 1, pp. 159–255.Google Scholar
Dry, M., and Ferreira, L. C. (1967). “The distribution of promoters in magnetite catalysts,” J. Catal. 7, 352–358.CrossRefGoogle Scholar
Hägg, G. (1934). “Pulverphotogramme eines neuen Eisencarbides,” Z. Kristallogr. 89, 92–94.CrossRefGoogle Scholar
Hirano, S.-I., and Tajima, S. (1990). “Synthesis and magnetic properties of Fe 5C 2 by reaction of iron oxide and carbon monoxide,” J. Mater. Sci. 25, 4457–4461.CrossRefGoogle Scholar
Hubbard, C. R., Mauer, F. A., and Swanson, H. E. (1975). “A silicon powder diffraction standard reference material,” J. Appl. Crystallogr. 8, 45–48.CrossRefGoogle Scholar
Sénateur, J. P., Fruchart, R., and Michel, A. (1962). “Formule et structure cristalline du carbure de Hägg,” Comptes Rendus Acad. Sci., Paris 255, 1615–1616.Google Scholar
Sénateur, J. P., and Fruchart, R. (1963). “Analogie structurale entre les carbures de fer Fe 3C et Fe 5C 2,”Comptes Rendus Acad. Sci., Paris 256, 3114–3117.Google Scholar
Smith, G. J., and Snyder, R. L. (1979). “F N: A criterion for rating powder diffraction patterns and evaluating the reliability of powder-pattern indexing,” J. Appl. Crystallogr. 12, 60–65.CrossRefGoogle Scholar