A New Cation-Ordered Structure Type with Multiple Thermal Redistributions in Co 2 InSbO 6
A New Cation-Ordered Structure Type with Multiple Thermal Redistributions in Co 2 InSbO 6
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Co 2 InSbO 6 中具有多重热再分布的新型阳离子有序结构
DOI：
10.1002/ange.202203062
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发表时间：
2022
影响因子：
--
通讯作者：
Ji K
中科院分区：
文献类型：
--
作者：
Ji K
固体中的阳离子有序对于控制物理性质是重要的，并导致钛铁矿（FeTiO 3）和LiNbO 3型衍生物的铁电结构，铁电性是由于后者的反转对称性的破坏。然而，从未观察到具有R32对称性的假设的第三ABO 3衍生物。在这里，我们发现从高压中回收的Co2 InSbO 6具有一种新的，有序的-R32 A2 BCO 6变体。Co2 InSbO 6还显著地显示出两种阳离子再分布，在加热时为（Co0.5In0.5）2CoSbO 6，然后为有序-LiNbO 3A 2BCO 6结构的Co2 InSbO 6变体。阳离子分布改变了磁性，因为最终的有序-LiNbO 3产物具有与初始有序-R32相不同的急剧亚铁磁转变。未来在压力下合成亚稳态的R32衍生物可能会揭示其他阳离子再分布途径，并可能使具有R32结构的ABO 3材料被发现。
Cation ordering in solids is important for controlling physical properties and leads to ilmenite (FeTiO3) and LiNbO3type derivatives of the corundum structure, with ferroelectricity resulting from breaking of inversion symmetry in the latter. However, a hypothetical third ABO3derivative withR32 symmetry has never been observed. Here we show that Co2InSbO6recovered from high pressure has a new, ordered‐R32 A2BCO6variant of the corundum structure. Co2InSbO6is also remarkable for showing two cation redistributions, to (Co0.5In0.5)2CoSbO6and then Co2InSbO6variants of the ordered‐LiNbO3A2BCO6structure on heating. The cation distributions change magnetic properties as the final ordered‐LiNbO3product has a sharp ferrimagnetic transition unlike the initial ordered‐R32 phase. Future syntheses of metastable corundum derivatives at pressure are likely to reveal other cation‐redistribution pathways, and may enable ABO3materials with theR32 structure to be discovered.