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Effect of partial substitution of Cr or Mn for Ga or Fe on crystal-structure and microstructures of GaFeO3

Published online by Cambridge University Press:  01 March 2012

Z. K. Heiba ,
Ali Abo-Shama ,
M. Bakr  and
Karimat El-Sayed
Z. K. Heiba
Affiliation:
Department of Physics, Faculty of Science, Ain-Shams University, Abbassia, Cairo 1156, Egypt
Ali Abo-Shama
Affiliation:
Department of Physics, Faculty of Science, Ain-Shams University, Abbassia, Cairo 1156, Egypt
M. Bakr
Affiliation:
Department of Physics, Faculty of Science, Ain-Shams University, Abbassia, Cairo 1156, Egypt
Karimat El-Sayed
Affiliation:
Department of Physics, Faculty of Science, Ain-Shams University, Abbassia, Cairo 1156, Egypt
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Abstract

Gallium iron oxide GaFeO3 and the substituted GaFeO3 with Cr and Mn, i.e., Ga(Fe0.95Me0.05)O3, and (Ga0.95Me0.05)FeO3; Me=Cr and Mn, have been synthesized and investigated by X-ray powder diffraction. The refined structural parameters of the considered samples using the Rietveld technique showed a considerable distortion in the polyhedron around different cations, which may have an effect on the piezoelectricity of the studied samples. There are also changes in the interatomic distances between different cations, which may have a direct influence on the ferromagnetic properties of the samples. Crystallite size and microstrain are anisotropic and the largest along the b axis, which may be responsible for the piezoelectricity. The correlations between all these changeable parameters will be discussed.

Keywords

gallium iron oxidemicrostructurecrystal-structure changes by substitution
Type
Technical Articles
Information
Powder Diffraction , Volume 22 , Issue 3 , September 2007 , pp. 256 - 258
Copyright
Copyright © Cambridge University Press 2007

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