研究目的
To optimize an enriched magnetoelectric coupling along with favorably tuned dielectric parameters in BFO-PTO based perovskite composites.
研究成果
The composites showed improved magnetic and ferroelectric properties with Sm-doping, reduced coercivity, and enhanced magnetoelectric coupling, particularly at x=0.06, making them suitable for multifunctional device applications such as data storage.
研究不足
The P-E loops were not saturated due to low applied field strength; leakage current issues persist due to volatilization of Pb and Bi and oxygen vacancies; the study is limited to room temperature measurements and specific doping levels.
1：Experimental Design and Method Selection:
The composites were prepared using sol-gel auto-combustion for Bi1-xSmxFe
2：95Mn05O3 and solid state reaction for PbTiO3 to achieve stoichiometric control and particle homogeneity. Sample Selection and Data Sources:
A series of composites with x =
3：00, 03, 06, 09, 12, and 15 were synthesized using analytical grade precursors from Sigma Aldrich. List of Experimental Equipment and Materials:
Equipment includes Bruker D/8 Advance X-ray diffractometer for XRD, LakeShore 7407 vibrating sample magnetometer for magnetic analysis, Radiant's precision multiferroic tester with Helmholtz coil for ferroelectric and magnetoelectric characterization, and 6500B series Wayne Kerr precision impedance analyzer for dielectric properties. Materials include bismuth nitrate, iron nitrate, samarium nitrate, manganese nitrate, glycine, urea, PbO, TiO2, and deionized water.
4：Experimental Procedures and Operational Workflow:
For BSFMO, precursors were dissolved, mixed, heated to form gel, auto-combusted at 350°C, and calcined at 550°C. For PTO, PbO and TiO2 were ball-milled and calcined at 800°C. Composites were mixed, pelletized using Apex-hydraulic press at 25 kN, and sintered at 400°C. Characterization involved XRD, VSM, ferroelectric loops, impedance analysis, and magnetoelectric measurements.
5：Data Analysis Methods:
XRD data matched with ICSD standards; magnetic parameters (Ms, Mr, Hc) and ferroelectric parameters (Pm, Pr) were extracted; dielectric and impedance data were analyzed using Maxwell Wagner theory and Jonscher's power law; magnetoelectric coefficient was calculated.
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