Abstract A novel Fe-Y composite oxide (Fe: Y-6.5) nano-cluster were synthesized by self-assembly approach. The α-Fe2O3 and cubic-Y2O3 nanocrystalline with diameter around 10 nm are homogeneously assembled to form a cluster architecture which constitute of Fe6.5Y composite oxide particles. Additional oxygen vacancies were introduced with cubic-Y2O3, and the oxygen vacancies as Fe3+–Vo–Y3+ between α-Fe2O3 and cubic-Y2O3 nanocrystalline generated by self-assembly process. Magnetic hysteresis loops recorded by vibrating sample magnetometry at 273 K display a ferromagnetic order, related to Fe3+–Vo–Y3+ act as defect centers in the bound magnetic polaron model for Fe-Y composite oxide nanomaterial. The ferromagnetic properties are proportional to oxygen vacancy contents, and maximum magnetization (Mm) value of the nano-cluster reaches 5.14 A·m2/g.

中文翻译：

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Fe-Y（Fe：Y-6.5）复合氧化物纳米团簇的室温铁磁性能通过一种极其简单和可扩展的方法

摘要 采用自组装方法合成了一种新型Fe-Y复合氧化物(Fe:Y-6.5)纳米团簇。直径约 10 nm 的 α-Fe2O3 和立方-Y2O3 纳米晶均匀组装，形成由 Fe6.5Y 复合氧化物颗粒构成的团簇结构。使用立方-Y2O3 引入了额外的氧空位，并且通过自组装过程产生的α-Fe2O3 和立方-Y2O3 纳米晶之间的氧空位为Fe3+–Vo–Y3+。通过在 273 K 振动样品磁力计记录的磁滞回线显示出铁磁有序，与 Fe3+–Vo–Y3+ 作为 Fe-Y 复合氧化物纳米材料的束缚磁极化子模型中的缺陷中心有关。铁磁性能与氧空位含量成正比，纳米团簇的最大磁化强度(Mm)达到5.14 A·m2/g。