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The structure characteristics of the diluted magnetic semiconductor Y2−xDyxO3

Published online by Cambridge University Press:  10 January 2013

B. Antic ,
P. Önnerud ,
D. Rodic  and
R. Tellgren
B. Antic
Affiliation:
Institute of Nuclear Sciences Vinca, Laboratory of Solid State Physics, P.O. Box 502, 11001 Belgrade, Serbia
P. Önnerud
Affiliation:
Institute of Chemistry, Uppsala University, Box 531, S-751 21 Uppsala, Sweden
D. Rodic
Affiliation:
Institute of Nuclear Sciences Vinca, Laboratory of Solid State Physics, P.O. Box 502, 11001 Belgrade, Serbia
R. Tellgren
Affiliation:
Institute of Chemistry, Uppsala University, Box 531, S-751 21 Uppsala, Sweden
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Abstract

The solid solutions Y2−xDyxO3 (x=0.20,0.50,0.74,1.40,1.80) were obtained by ceramic technology. The crystal structures were refined from X-ray and neutron diffraction data measurements in the cubic space group Ia3 by the Rietveld method. The unit cell dimensions varied from 10.6056(4) Å to 10.6624(1) Å. The structure characteristics were analyzed in relation to the concentration of the magnetic ion. The selected cation–anion–cation bonds, important for the understanding of the superexchange interaction and the magnetic properties, are given. In all samples the Dy3+ ions are randomly distributed in the cation sites 8(b) and 24(d). Comparing the random cation distribution in Y2−xDyxO3 and the preferential distribution in Y2−xGdxO3, it has been concluded that the type of distribution depends on the difference of the lattice constants between RE2O3 and Y2O3. Hence, in this cubic Mn2O3-type of structure, a preferential distribution can be expected in Y2−xNdxO3, Y2−xSmxO3, Y2−xEuxO3, Y2−xLuxO3, and a random distribution in Y2−xHoxO3.

Keywords

yttrium oxidedysprosium oxidemixed rare-earth oxidesneutron and X-ray diffractioncationic distribution

Information

Type
Research Article
Information
Powder Diffraction , Volume 8 , Issue 4 , December 1993 , pp. 216 - 220
Copyright
Copyright © Cambridge University Press 1993

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