Multiferroic properties of Bi5.75R0.25Fe1.4Ni0.6Ti3O18 (R = Eu, Sm, Nd, Bi and La) ceramics
| Autor: | Yongjie Yin, Xiangyu Mao, Wei Wang, Fei Liu |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
Materials science
biology Analytical chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology biology.organism_classification 01 natural sciences Ferroelectricity 0104 chemical sciences Aurivillius symbols.namesake Geochemistry and Petrology Remanence visual_art Phase (matter) visual_art.visual_art_medium symbols Multiferroics Orthorhombic crystal system Ceramic 0210 nano-technology Raman spectroscopy |
| Zdroj: | Journal of Rare Earths. 40:112-117 |
| ISSN: | 1002-0721 |
| DOI: | 10.1016/j.jre.2020.11.019 |
| Popis: | An improved technique was used to prepare the ceramic samples of Bi5.75R0.25Fe1.4Ni0.6Ti3O18 (BRFNT, R = Eu, Sm, Nd, Bi, and La). The five-layer Aurivillius phase of the samples was confirmed by X-ray diffraction (XRD) without detectable impurities. BRFNT samples exhibit the pseudo-tetragonal except the orthorhombic BSmFNT samples. The characteristic plate-like morphology was revealed by field emission transmission electron microscopy (FETEM) images. At ambient temperature, all the samples present both ferroelectric and magnetic properties and BEuFNT shows the best ferroelectric behavior with its remanent polarization as high as 14.9 μC/cm2 under 155 kV/cm, which is three times higher than that of Bi6Fe1.4Ni0.6Ti3O18. Moreover, the remanent magnetization of BEuFNT is increased up to 1.20 emu/g compared to that of Bi6Fe1.4Ni0.6Ti3O18 which is only 0.53 emu/g. With increasing radius of the introduced A-site ions, the ferroelectric phase transition temperature (TCE) is decreased while the magnetic phase transition temperature (TCM) fluctuates. The decrease in both TCE and TCM corresponds to the upward shift of the related Raman modes and vice versa, indicating that the TCE and the TCM depend not only on the t factor, but also on the strength of the covalent bonds. |
| Databáze: | OpenAIRE |
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