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Preparation and structural characterization of the rare-earth oxides BaR2O4, R=Pr, Tb

Published online by Cambridge University Press:  10 January 2013

C. Cascales  and
I. Rasines
C. Cascales*
Affiliation:
Instituto de Ciencia de Materiales, CSIC. Serrano 113, E-28006 Madrid, Spain
I. Rasines
Affiliation:
Instituto de Ciencia de Materiales, CSIC. Serrano 113, E-28006 Madrid, Spain
*
a)To whom correspondence should be addressed.
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Abstract

The compounds BaR2O4, (R = Pr, Tb), where R are two of the less frequent trivalent lanthanides, have been prepared under reducing atmosphere from mixtures of BaO2, the R metals, and the oxides Pr2O3 and Tb4O7, respectively. The crystal structure of BaR2O4 have been refined from X-ray powder diffraction data by the Rietveld method of profile analysis using 31 parameters in each case. Both oxides are orthorhombic, isotypic with SrY2O4, of the perovskite-related CaFe2O4 structure type, S.G. Pnma (No. 62), Z = 4, a = 10.6113(8), b = 3.6303(3), c = 12.485(1) Å, and V = 480.93(5) Å3 for R = Pr; and a = 10.4282(8), b = 3.4893(3), c = 12.1809(6) Å, and V = 443.22(3) Å3 for R = Tb. The R–O distances vary between 2.15(6) to 3.40(6) Å for R = Pr, and between 2.15(3) to 2.91(5) Å for R = Tb.

Type
Research Article
Information
Powder Diffraction , Volume 10 , Issue 2 , June 1995 , pp. 122 - 126
Copyright
Copyright © Cambridge University Press 1995

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