研究目的
To investigate the modulation of multiferroic properties in BiFeO3 ceramics induced by Dy and transition metals (Cr, Mn, Ni) co-doping, focusing on structural, magnetic, and ferroelectric behaviors.
研究成果
Dy and transition metals co-doping significantly enhances the multiferroic properties of BiFeO3 ceramics. Cr and Ni co-doping improve magnetic properties due to local ferromagnetic coupling, while Dy substitution enhances ferroelectric properties by reducing oxygen vacancies and leakage current. This co-doping approach is effective for practical applications in multiferroic devices.
研究不足
The study is limited to specific co-doping combinations (Dy with Cr, Mn, Ni) and may not generalize to other dopants. The presence of impurity phases in some samples (e.g., Bi2Fe4O9 in Ni-doped) could affect properties, and the theoretical calculations are based on idealized models that may not fully capture real-world complexities.
1：Experimental Design and Method Selection:
The study used a combined experimental and theoretical approach. Ceramics were synthesized via solid-state reaction, and properties were characterized using XRD, SEM, EDS, VSM, XPS, and ferroelectric measurements. First-principles calculations were performed using VASP for theoretical insights.
2：Sample Selection and Data Sources:
Samples included pure BFO and Bi0.95Dy0.05Fe0.95T0.05O3 (T = Cr, Mn, Ni) ceramics. Starting materials were Bi2O3, Fe2O3, Cr2O3, Mn2O3, Ni2O3 in stoichiometric ratios.
3：95Dy05Fe95T05O3 (T = Cr, Mn, Ni) ceramics. Starting materials were Bi2O3, Fe2O3, Cr2O3, Mn2O3, Ni2O3 in stoichiometric ratios.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a planetary ball mill, X-ray diffractometer (Bruker D8 Advance), SEM (JEOL-6380LV), EDS (HORIBA EMAX Energy EX-250), VSM (MPMSeVSM), XPS (ESCALAB 250Xi), and Radiant precision materials analyzer. Materials were oxides of Bi, Fe, Cr, Mn, Ni.
4：Experimental Procedures and Operational Workflow:
Mixtures were ball-milled, dried, pressed into pellets, precalcined at 500°C for 2h, and annealed at 850°C for 30min. Structural, morphological, magnetic, and ferroelectric properties were measured as per standard protocols.
5：Data Analysis Methods:
XRD data were refined using FullProf software. Magnetic and ferroelectric data were analyzed from hysteresis loops. XPS data were fitted with mixed Gauss-Lorentz functions. First-principles calculations used VASP with PAW method.
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