Synthesis and structural characterisation of the new K2NiF4-type phases, A(2)In(0.5)Sb(0.5)O(4) (A = Sr, Ba)

R Heap, M S Islam, P R Slater

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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 A(2)M(0.5)(III)M(0.5)('V)O(4) with both 3+ and 5+ cations in the octahedral sites. Ba2In0.5Sb0.5O4 is shown to have a tetragonal cell [ space group I 4/mmm, a = 4.1651( 1), c = 13.299( 1) Angstrom] 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) Angstrom]. 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.
Original languageEnglish
Pages (from-to)460-463
Number of pages4
JournalDalton Transactions
Issue number3
DOIs
Publication statusPublished - 2005

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Synthesis and structural characterisation of the new K2NiF4-type phases, A(2)In(0.5)Sb(0.5)O(4) (A = Sr, Ba). / Heap, R; Islam, M S; Slater, P R.

In: Dalton Transactions, No. 3, 2005, p. 460-463.

Research output: Contribution to journalArticle

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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 A(2)M(0.5)(III)M(0.5)('V)O(4) with both 3+ and 5+ cations in the octahedral sites. Ba2In0.5Sb0.5O4 is shown to have a tetragonal cell [ space group I 4/mmm, a = 4.1651( 1), c = 13.299( 1) Angstrom] 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) Angstrom]. 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.",
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AU - Islam, M S

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N2 - 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 A(2)M(0.5)(III)M(0.5)('V)O(4) with both 3+ and 5+ cations in the octahedral sites. Ba2In0.5Sb0.5O4 is shown to have a tetragonal cell [ space group I 4/mmm, a = 4.1651( 1), c = 13.299( 1) Angstrom] 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) Angstrom]. 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.

AB - 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 A(2)M(0.5)(III)M(0.5)('V)O(4) with both 3+ and 5+ cations in the octahedral sites. Ba2In0.5Sb0.5O4 is shown to have a tetragonal cell [ space group I 4/mmm, a = 4.1651( 1), c = 13.299( 1) Angstrom] 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) Angstrom]. 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.

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