Karpinsky Dmitry V, Silibin Maxim V, Latushka Siarhei I, Zhaludkevich Dmitry V, Sikolenko Vadim V, Al-Ghamdi Hanan, Almuqrin Aljawhara H, Sayyed M I, Belik Alexei A
Scientific-Practical Materials Research Centre of NAS of Belarus, 220072 Minsk, Belarus.
Institute of Advanced Materials and Technologies, National Research University of Electronic Technology "MIET", Zelenograd, 124498 Moscow, Russia.
Nanomaterials (Basel). 2022 May 5;12(9):1565. doi: 10.3390/nano12091565.
The crystal structure and magnetic state of the (1 − x)BiFeO3-(x)BiMnO3 solid solution has been analyzed by X-ray diffraction using lab-based and synchrotron radiation facilities, magnetization measurements, differential thermal analysis, and differential scanning calorimetry. Dopant concentration increases lead to the room-temperature structural transitions from the polar-active rhombohedral phase to the antipolar orthorhombic phase, and then to the monoclinic phase accompanied by the formation of two-phase regions consisting of the adjacent structural phases in the concentration ranges 0.25 < x1 < 0.30 and 0.50 ≤ x2 < 0.65, respectively. The accompanied changes in the magnetic structure refer to the magnetic transitions from the modulated antiferromagnetic structure to the non-colinear antiferromagnetic structure, and then to the orbitally ordered ferromagnetic structure. The compounds with a two-phase structural state at room temperature are characterized by irreversible temperature-driven structural transitions, which favor the stabilization of high-temperature structural phases. The magnetic structure of the compounds also exhibits an irreversible temperature-induced transition, resulting in an increase of the contribution from the magnetic phase associated with the high-temperature structural phase. The relationship between the structural parameters and the magnetic state of the compounds with a metastable structure is studied and discussed depending on the chemical composition and heating prehistory.
利用实验室和同步辐射设施的X射线衍射、磁化测量、差热分析和差示扫描量热法，对(1 - x)BiFeO3-(x)BiMnO3固溶体的晶体结构和磁态进行了分析。掺杂剂浓度增加导致室温下结构从极性活性菱方相转变为反极性正交相，然后转变为单斜相，同时在浓度范围0.25 < x1 < 0.30和0.50 ≤ x2 < 0.65内分别形成由相邻结构相组成的两相区域。伴随的磁结构变化是指从调制反铁磁结构到非共线反铁磁结构，再到轨道有序铁磁结构的磁转变。室温下具有两相结构状态的化合物具有不可逆的温度驱动结构转变，这有利于高温结构相的稳定。化合物的磁结构也表现出不可逆的温度诱导转变，导致与高温结构相相关的磁相贡献增加。根据化学成分和加热预处理情况，研究并讨论了具有亚稳结构的化合物的结构参数与磁态之间的关系。
