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Powder XRD study of Ba4Eu3F17: A new anion rich fluorite related mixed fluoride

Published online by Cambridge University Press:  05 March 2012

S. N. Achary ,
S. J. Patwe  and
A. K. Tyagi
S. N. Achary
Affiliation:
Applied Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
S. J. Patwe
Affiliation:
Applied Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
A. K. Tyagi*
Affiliation:
Applied Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
*
a)Author to whom correspondence should be addressed. Fax: 0091-22-550 5151/551 9613. Electronic mail: aktyagi@magnum.barc.ernet.in
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Abstract

The compound Ba4Eu3F17 was prepared by heating pre-dried BaF2 and EuF3 (4:3) at 800 °C for 8 h in static vacuum. The colorless polycrystalline product obtained was characterized by Rietveld refinement of the observed powder diffraction data with a starting model of Ba4Y3F17. The title compound Ba4Eu3F17 crystallizes in rhombohedral lattice with lattice parameters, a=11.1787(4) and c=20.5789(10) Å, Z=3 (Space group R 3, No. 148). The Ba4Eu3F17 structure can be described as an ordered anion-rich fluorite type structure with the formation of Eu6F37 clusters. There are two crystallographically distinct Ba (CN=10, 11) and one distinct Eu (CN=8). The typical Ba(1)–F, Ba(2)–F, and Eu–F bond lengths range from 2.56 to 2.83 Å, 2.54 to 3.25 Å, and 2.24 to 2.49 Å, respectively. The salient feature of the structure is that the EuF8 polyhedra share their corner to form a cubo-octahedron of fluoride ions. The cubic BaF8 polyhedra of BaF2 are modified to Ba(1)–F10 and Ba(2)–F11 polyhedra in this structure. The cubo-octahedron encloses extra fluorine F(8) inside it.

Keywords

anion-excess fluoritebarium europium fluorideRietveld refinement
Type
New Diffraction Data
Information
Powder Diffraction , Volume 17 , Issue 3 , September 2002 , pp. 225 - 229
Copyright
Copyright © Cambridge University Press 2002

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