Abstract The room- and low-temperature neutron diffraction measurements of the Bi0.9Ca0.1Fe0.6Mn0.4O3+δ compound have been carried out to disclose the influence of Mn substitution on the multiferroic properties of the low-doped Bi1−xCaxFeO3−x/2 perovskites combining ferroelectric and weak ferromagnetic behavior. It has been proven that the material under study retains a polar R3c structure specific to the parent Bi0.9Ca0.1FeO2.95. The Mn doping results in the elimination of oxygen vacancies giving rise to the increase in spontaneous electric polarization. The chemical modification stabilizes the collinear antiferromagnetic structure at room temperature. The reorientation of the antiferromagnetic vector from the c to a axis takes place with decreasing temperature. Reflecting the competitive character of the superexchange interactions between Fe3+, Mn3+ and Mn4+, the coexistence of ferromagnetic glassy and antiferromagnetic long-range-ordered phases is observed at low temperatures.

中文翻译：

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Mn取代对Bi1-xCaxFeO3-x/2多铁性材料晶体和磁结构的影响

摘要 对 Bi0.9Ca0.1Fe0.6Mn0.4O3+δ 化合物进行了室温和低温中子衍射测量，揭示了 Mn 取代对低掺杂 Bi1-xCaxFeO3-x 多铁性的影响。 /2 钙钛矿结合了铁电和弱铁磁行为。已经证明，所研究的材料保留了母体 Bi0.9Ca0.1FeO2.95 特有的极性 R3c 结构。Mn 掺杂导致氧空位的消除，从而导致自发电极化的增加。化学改性在室温下稳定共线反铁磁结构。随着温度的降低，反铁磁矢量从 c 到轴的重新定向发生。反映了 Fe3+ 之间超交换相互作用的竞争特征，