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Issue 37, 2014
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Oxygen-driven competition between low-dimensional structures of Sr3CoMO6 and Sr3CoMO7−δ with M = Ru, Ir

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Abstract

We have realized a reversible structure transformation of one-dimensional 1D K4CdCl6-type Sr3CoMO6 with the Co2+/M4+ cation ordering into the two-dimensional 2D double layered Ruddlesden–Popper structure Sr3CoMO7−δ with a random distribution of Co and M (with M = Ru, Ir) upon increasing the partial oxygen pressure. The combined soft and hard X-ray absorption spectroscopy studies show that under transformation, Co and M cations were oxidized to Co3+ and M5+. During oxidation, high-spin Co2+ in Sr3CoMO6 first transforms into high-spin Co3+ in oxygen-deficient Sr3CoMO7−δ, and then further transforms into low-spin Co3+ in fully oxidized Sr3CoMO7 upon further increasing the partial pressure of oxygen. The 1D Sr3CoMO6 compound is magnetically ordered at low temperatures with the magnetic moments lying along the c-axis. Their alignment is parallel for Sr3CoRuO6 and antiparallel for Sr3CoIrO6. The 2D compounds reveal a spin-glass-like behavior related to the random distribution of magnetic cations in the structure.

Graphical abstract: Oxygen-driven competition between low-dimensional structures of Sr3CoMO6 and Sr3CoMO7−δ with M = Ru, Ir

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Publication details

The article was received on 24 Jun 2014, accepted on 28 Jul 2014 and first published on 28 Jul 2014


Article type: Paper
DOI: 10.1039/C4DT01893A
Citation: Dalton Trans., 2014,43, 13883-13891
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    Oxygen-driven competition between low-dimensional structures of Sr3CoMO6 and Sr3CoMO7−δ with M = Ru, Ir

    D. Mikhailova, P. Reichel, A. A. Tsirlin, A. M. Abakumov, A. Senyshyn, K. M. Mogare, M. Schmidt, C. Kuo, C. Pao, T. Pi, J. Lee, Z. Hu and L. H. Tjeng, Dalton Trans., 2014, 43, 13883
    DOI: 10.1039/C4DT01893A

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