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Rietveld refinement of transition metal doped ZnO

Published online by Cambridge University Press:  06 March 2012

D. A. A. Santos ,
A. D. P. Rocha  and
M. A. Macêdo
D. A. A. Santos
Affiliation:
Physics Department, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
A. D. P. Rocha
Affiliation:
Physics Department, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
M. A. Macêdo
Affiliation:
Physics Department, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
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Abstract

Nanocrystals of Zn1−xMxO (M=Mn, Co, or Ni) were grown using proteic sol-gel process, and the crystalline phases were identified by X-ray diffraction and Rietveld refinement. The nanocrystals have hexagonal wurtzite structure, with space group P63mc. The insertion of Mn2+ in the place of Zn2+ provoked an increase in the size of the nanocrystals, and the insertion of Co2+ or Ni2+ caused a reduction in the sizes of the nanocrystals, as compared to pure ZnO. This occurred because these three transition metals have very different ionic radii (Co2+=0.58 A˚, Mn2+=0.66 A˚, Ni2+=0.55 A˚, and Zn2+=0.60 A˚).

Keywords

Rietveld refinementXRDZnO
Type
Technical Articles
Information
Powder Diffraction , Volume 23 , Special Issue S1 , March 2008 , pp. S36 - S41
Copyright
Copyright © Cambridge University Press 2008

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