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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Oxygen-driven competition between lowdimensional structures of Sr_3CoMO_6 and Sr_3CoMO_(7?δ) with M = Ru, Ir
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Oxygen-driven competition between lowdimensional structures of Sr_3CoMO_6 and Sr_3CoMO_(7?δ) with M = Ru, Ir

机译：M = Ru，Ir的Sr_3CoMO_6和Sr_3CoMO_（7？δ）低维结构之间的氧驱动竞争

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摘要

We have realized a reversible structure transformation of one-dimensional 1D K_4CdCl_6-type Sr_3CoMO_6 with the Co~(2+)/M~(4+) cation ordering into the two-dimensional 2D double layered Ruddlesden–Popper structure Sr_3CoMO_(7?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 Co~(3+) and M~(5+). During oxidation, high-spin Co~(2+) in Sr_3CoMO_6 first transforms into high-spin Co~(3+) in oxygen-deficient Sr_3CoMO_(7?δ), and then further transforms into low-spin Co~(3+) in fully oxidized Sr_3CoMO_7 upon further increasing the partial pressure of oxygen. The 1D Sr_3CoMO_6 compound is magnetically ordered at low temperatures with the magnetic moments lying along the c-axis. Their alignment is parallel for Sr_3CoRuO_6 and antiparallel for Sr_3CoIrO_6. The 2D compounds reveal a spin-glass-like behavior related to the random distribution of magnetic cations in the structure.
机译：我们已经实现了将具有Co〜（2 +）/ M〜（4+）阳离子顺序的一维1D K_4CdCl_6型Sr_3CoMO_6的可逆结构转换为二维二维双层Ruddlesden–Popper结构Sr_3CoMO_（7？δ ），随着氧气分压的增加，Co和M的分布随机（M = Ru，Ir）。结合软，硬X射线吸收光谱研究表明，在转变过程中，Co和M阳离子被氧化为Co〜（3+）和M〜（5+）。在氧化过程中，Sr_3CoMO_6中的高自旋Co〜（2+）首先在缺氧的Sr_3CoMO_（7？δ）中转化为高自旋Co〜（3+），然后进一步转化为低自旋Co〜（3+） ）进一步提高氧气的分压后，在完全氧化的Sr_3CoMO_7中）。 1D Sr_3CoMO_6化合物在低温下磁化有序，其磁矩沿c轴分布。 Sr_3CoRuO_6的对齐方式平行，而Sr_3CoIrO_6的对齐方式平行。 2D化合物显示出与结构中磁性阳离子的随机分布有关的类似自旋玻璃的行为。

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