Structural and magnetic properties of Sr4–xMxIrO6(M = Ca, Zn, Cd, Li, Na)
- 1 January 1996
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 6 (3) , 395-401
- https://doi.org/10.1039/jm9960600395
Abstract
The compounds Sr4–xCaxIrO6(x = 0.5, 1, 2, 3, 4) and Sr3MIrO6(M = Li, Na, Zn, Cd) have been synthesized and studied by X-ray powder diffraction and SQUID magnetometry. They all adopt the K4CdCl6 structure, with the cations M and Ca occupying only the trigonal prismatic sites in the [001] chains unless x > 1. Those compounds which contain only IrIV order antiferromagnetically at temperatures between 14 and 22 K, and those which contain only IrV show temperature-independent paramagnetism. The development of a self-consistent interatomic potential for the IrIV–O interaction is described. The lattice parameters predicted for the K4CdCl6-like phases using this new potential agree with the experimental values to within ca. 2%.Keywords
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