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Ca(4)IrO(6), Ca(3)MgIrO(6) and Ca(3)ZnIrO(6).

M J Davis¹, M D Smith, H C zur Loye

¹Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208, USA.

Acta Crystallographica. Section C, Crystal Structure Communications

|November 14, 2001

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New iridium oxide compounds, Ca(4)IrO(6), Ca(3)MgIrO(6), and Ca(3)ZnIrO(6), were synthesized and structurally analyzed. These materials exhibit a novel structure composed of alternating prisms and octahedra, offering insights into complex oxide materials.

Area of Science:

Solid-state chemistry
Inorganic materials science
Crystallography

Background:

Iridium oxides are known for diverse electronic and magnetic properties.
Understanding the structural motifs of complex oxides is crucial for materials design.

Purpose of the Study:

To synthesize and characterize novel iridium-containing compounds.
To determine the crystal structure of Ca(4)IrO(6), Ca(3)MgIrO(6), and Ca(3)ZnIrO(6).

Main Methods:

High-temperature flux growth technique for crystal synthesis.
Single-crystal X-ray diffraction for structural determination.

Main Results:

Successfully prepared single crystals of tetracalcium iridium hexaoxide (Ca(4)IrO(6)), tricalcium magnesium iridium hexaoxide (Ca(3)MgIrO(6)), and tricalcium zinc iridium hexaoxide (Ca(3)ZnIrO(6)).

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All three compounds are isostructural, adopting the K(4)CdCl(6) structure type.

The structure features chains of alternating face-shared trigonal prisms ([CaO(6)], [MgO(6)], or [ZnO(6)]) and [IrO(6)] octahedra, with surrounding columns of Ca(2+) ions.

Conclusions:

The K(4)CdCl(6) structure type provides a framework for novel iridium oxide materials.
The structural characterization offers a foundation for exploring the physical properties of these compounds.