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

Heap, Richard, Islam, Saiful and Slater, Peter (2004) Synthesis and structural characterisation of the new K2NiF4-type phases, A2In0.5Sb0.5O4 (A=Sr, Ba) Dalton Trans..

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Abstract

In this paper we report the synthesis and structural characterisation of two new K2NiF4-type phases, Ba2In0.5Sb0.5O4 and Sr2In0.5Sb0.5O4. To our knowledge 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.

Item Type: Article
Additional Information: R. Heap, M.S. Islam, P.R. Slater; Dalton Trans. 2005, 460.
Uncontrolled Keywords: K2NiF4 structure, neutron diffraction, Indium, Antimony
Divisions: Faculty of Engineering and Physical Sciences > Chemistry
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:43
Last Modified: 23 Sep 2013 18:34
URI: http://epubs.surrey.ac.uk/id/eprint/1678

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