期刊
SOLID STATE COMMUNICATIONS
卷 341, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2021.114595
关键词
Multiferroics; XAFS; Phase transitions
资金
- Fundamental Research Funds for the Central Universities [ZY20210320]
The structure of La doped BiFeO3 at low doping content is not completely the believed hexagonal R3c phase, but contains an orthorhombic crystal symmetry. Under certain pressure conditions, a phase transition sequence from hexagonal R3c phase to monoclinic C2/m phase and then to orthorhombic Pnma phase was observed in La-doped BiFeO3.
The structure of La doped BiFeO3, prepared by the conventional hydrothermal method, were investigated at room temperature using X-ray diffraction (XRD), X-ray absorption fine structure (XAFS) spectroscopy. The XAFS spectra showed that La in fact substitute the Bi site of secondary nanosized particles with orthorhombic symmetry instead of the long-believed rhombohedral R3c phase at low-content doping. The pressure-induced phasetransition sequences of La-doped BiFeO3, which mixed nanoscale orthorhombic symmetry in the R3c crystal structure were investigated using synchrotron radiation X-ray diffraction up to 27.3 GPa. Our experimental data clearly showed that rohombohedral (R3c) phase first transforms to monoclinic (C2/m) phase at 6.5 GPa, then to orthorhombic (Pnma) phase at 13.5 GPa, and the coexistence of multiple intermediate phases are observed before two transitions, revealing that the doping-induced nanoparticles with orthorhombic structure did drive the change in symmetry and transition pressure.
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