刚玉
亚稳态
铁磁性
钛铁矿
铁电性
相变
凝聚态物理
化学物理
材料科学
点反射
尖晶石
结晶学
化学
矿物学
物理
磁化
磁场
量子力学
光电子学
电介质
有机化学
冶金
作者
J. Paul Attfield,Kunlang Ji,Elena Solana‐Madruga,Midori Amano Patiño,Yuichi Shimakawa
标识
DOI:10.1002/anie.202203062
摘要
Abstract Cation ordering in solids is important for controlling physical properties and leads to ilmenite (FeTiO 3 ) and LiNbO 3 type derivatives of the corundum structure, with ferroelectricity resulting from breaking of inversion symmetry in the latter. However, a hypothetical third ABO 3 derivative with R 32 symmetry has never been observed. Here we show that Co 2 InSbO 6 recovered from high pressure has a new, ordered‐ R 32 A 2 BCO 6 variant of the corundum structure. Co 2 InSbO 6 is also remarkable for showing two cation redistributions, to (Co 0.5 In 0.5 ) 2 CoSbO 6 and then Co 2 InSbO 6 variants of the ordered‐LiNbO 3 A 2 BCO 6 structure on heating. The cation distributions change magnetic properties as the final ordered‐LiNbO 3 product has a sharp ferrimagnetic transition unlike the initial ordered‐ R 32 phase. Future syntheses of metastable corundum derivatives at pressure are likely to reveal other cation‐redistribution pathways, and may enable ABO 3 materials with the R 32 structure to be discovered.
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