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Issue 3, 2005
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Synthesis and structural characterisation of the new K2NiF4-type phases, A2In0.5Sb0.5O4 (A = Sr, Ba)

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Abstract

In this paper the synthesis and structural characterisation of two new K2NiF4-type phases, Ba2In0.5Sb0.5O4 and Sr2In0.5Sb0.5O4, are reported. These are the first examples of K2NiF4 compounds of general formula A2MIII0.5M’V0.5O4 with both 3+ and 5+ cations in the octahedral sites. Ba2In0.5Sb0.5O4 is shown to have a tetragonal cell [space group I4/mmm, a = 4.1651(1), c = 13.299(1) Å] with an essentially disordered arrangement of In and Sb. In the case of Sr2In0.5Sb0.5O4, however, ordering of In and Sb is observed leading to an expanded unit cell [Pmcb, a = 5.7592(1), b = 5.7740(1), c = 12.543(1) Å]. The results therefore show that varying the size of the alkaline earth cation has a pronounced effect on the ordering of In and Sb within the structure.

Graphical abstract: Synthesis and structural characterisation of the new K2NiF4-type phases, A2In0.5Sb0.5O4 (A = Sr, Ba)

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Article information


Submitted
29 Oct 2004
Accepted
23 Nov 2004
First published
17 Dec 2004

Dalton Trans., 2005, 460-463
Article type
Paper

Synthesis and structural characterisation of the new K2NiF4-type phases, A2In0.5Sb0.5O4 (A = Sr, Ba)

R. Heap, M. S. Islam and P. R. Slater, Dalton Trans., 2005, 460
DOI: 10.1039/B416580B

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