Abstract Ba4SmFe0.5Nb9.5O30 ceramics were prepared by solid-state reaction method and the sample crystallized into single phase tungsten bronze (TB) structure with space group P4bm. The absence of dielectric peak suggests that there is no long-range ferroelectric order exists above room temperature (RT). Therefore, the observed ferroelectric property should be related to the polar nanoregions that survived to Burns temperature TB. Obvious RT ferromagnetism is observed for the first time in Ba4SmFe0.5Nb9.5O30 ceramics and it could be interpreted as the effective exchange coupling interaction between oxygen vacancies and Fe ions 3d spins, while the isolated Fe ions create the paramagnetic characteristic. In addition, the RT ferromagnetism and ferroelectricity also confirms that introduce of Fe ions could help to change TB structural ferroelectric to RT multiferroic material effectively.

中文翻译：

---

Ba4SmFe0.5Nb9.5O30陶瓷中室温铁磁和铁电性能的共存

摘要 采用固相反应法制备了Ba4SmFe0.5Nb9.5O30陶瓷，样品结晶成单相钨青铜(TB)结构，空间群为P4bm。介电峰的缺失表明在室温 (RT) 以上不存在长程铁电有序。因此，观察到的铁电特性应该与在烧伤温度 TB 下存活的极性纳米区域有关。首次在 Ba4SmFe0.5Nb9.5O30 陶瓷中观察到明显的 RT 铁磁性，这可以解释为氧空位和 Fe 离子 3d 自旋之间的有效交换耦合相互作用，而孤立的 Fe 离子产生顺磁性。此外，