[Zurück]

Z. Heiba, M. El-Hagary, H. Michor, G. Hilscher:
"The effect of Co substitution of Si on the structural and microstructural properties of GdCo_9+xSi_4-x";
Intermetallics, 14 (2006), S. 220 - 223.

The effect of Co substitution of Si on the structural and microstructural properties of GdCo_9+xSi_4-x

Z.K. Heiba a, M. El-Hagary b, c, H. Michor c and G. Hilscher c

a Physics Department, Faculty of Science, Ain ShamsUniversity, Cairo, Egypt
b Physics Department, Faculty of Science, Helwan University, Helwan 11792, Cairo, Egypt
c Institut für Festkörperphysik, TU Wien, Wiedner Hauptstrasse 8-10, A-1040 Wien, Austria

Received 7 April 2005; revised 9 May 2005; accepted 30 May 2005. Available online 28 July 2005.

Abstract

Polycrystalline samples of GdCo_9+xSi_4-x (x=0.0, 0.2, 0.4) were synthesized by high frequency induction melting. X-ray diffraction data were collected and crystal structure and microstructure analysis were performed using the Rietveld technique. All samples were found to have the same tetragonal crystal system with the space group I 4/mcm. They form solid solutions over the whole range of x. Decreasing the Si content from the value 4 results in an increase of the lattice parameter a and a decrease of c, both change linearly with x. Replacing Si by Co on the site 16l₍₂₎ introduces systematic changes in atomic coordinates. Crystallite size and microstrain analysis is performed along different crystallographic directions and both are found to vary anisotropically with x.

Keywords: A. Rare-earth intermetallics; D. Microstructure; F. Diffraction (electron, neutron and X-ray).

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05937997

http://dx.doi.org/10.1016/j.intermet.2005.05.009