Abstract This report reveals the room temperature magnetodielectric effect of polycrystalline BiFe0.8Mn0.2O3 ceramics. Structural analysis shows that the additional phases of BiFe0.8Mn0.2O3 are suppressed and compared with bare BiFeO3. The difference in dissociation energies between Mn–O and Bi–O bonds traps the motion of oxygen ions and reduces the grain size of BiFe0.8Mn0.2O3. Mn-doped BiFeO3 samples exhibit a weak ferromagnetic response because of the effect of Mn in the Fe site which uncurls the spiral spin ordering by altering the canting angle. Additionally, Bi vacancies give rise to charge compensating oxidation of Mn3+/ Mn4+ which causes the ferromagnetic weaker. BiFe0.8Mn0.2O3 shows an improved dielectric permittivity compared to BiFe0.9Mn0.1O3 and BiFeO3 respectively. The magnetodielectric coupling coefficient of BiFe0.8Mn0.2O3 ceramic at 6 kOe and 1 MHz is determined to be 4.64%.

中文翻译：

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Mn掺杂对多晶BiFeO3陶瓷磁介电性能的影响

摘要 本报告揭示了多晶 BiFe0.8Mn0.2O3 陶瓷的室温磁介电效应。结构分析表明，与裸 BiFeO3 相比，BiFe0.8Mn0.2O3 的附加相受到抑制。Mn-O 和 Bi-O 键之间解离能的差异捕获了氧离子的运动并减小了 BiFe0.8Mn0.2O3 的晶粒尺寸。Mn 掺杂的 BiFeO3 样品表现出弱的铁磁响应，这是因为 Fe 位点中的 Mn 通过改变倾斜角来展开螺旋自旋排序。此外，Bi 空位引起 Mn3+/Mn4+ 的电荷补偿氧化，这导致铁磁变弱。BiFe0.8Mn0.2O3 分别与 BiFe0.9Mn0.1O3 和 BiFeO3 相比显示出改进的介电常数。BiFe0.8Mn0 的磁介电耦合系数。