AI 中文总结
本研究合成无铅多铁复合材料，探究组成与烧结温度对其性能的影响，优化得到的30CTFO-70BTO复合材料磁电系数达1.28 mV/cm.Oe，可用于低功耗多功能器件
AI 中文摘要
本研究对无铅多铁复合材料(x)Co1.2Ti0.2Fe1.6O4 - (100-x)BaTiO3（x=10、20、30）开展系统研究，该复合材料采用固相反应法合成，旨在探究组成与烧结温度对其结构、电学、磁学及磁电（ME）性能的影响。X射线衍射结合里特维德精修证实，四方相BaTiO3（BTO）与立方尖晶石Co1.2Ti0.2Fe1.6O4（CTFO）两相共存。微观结构分析表明，较高烧结温度下致密化程度与晶粒生长更优，可提升两相之间的耦合效果。介电与铁电研究显示，因导电相的漏电流，极化-电场（P-E）行为存在损耗；磁学性能则随铁氧体含量增加，磁化强度提升。所有复合材料均呈现磁电系数，其大小取决于组成与烧结条件；在1200℃烧结的30CTFO - 70BTO复合材料中，观测到最高磁电系数，约为1.28 mV/cm.Oe。该提升源于磁致伸缩与压电响应的最优平衡，以及界面应变传递的改善。这些结果表明，同时优化掺杂改性的组成与烧结条件，对实现块体多铁复合材料中磁电耦合性能的提升至关重要。此外，研究结果还证实，无铅复合材料在下一代低功耗技术的多功能器件应用中具有潜力，包括高密度非易失性存储器（如FeRAM/MRAM）、磁场传感器、自旋电子器件及致动器等领域。
英文摘要
This work presents a systematic study of lead-free multiferroic composites of (x)Co1.2Ti0.2Fe1.6O4 - (100-x)BaTiO3 (x = 10, 20, 30), which were synthesized by a solid-state reaction method to investigate the effects of composition and sintering temperature on their structural , electrical, magnetic, and magnetoelectric (ME) properties. X-ray diffraction along with Rietveld refinement confirms the coexistence of tetragonal BaTiO3 (BTO) and cubic spinel Co1.2Ti0.2Fe1.6O4 (CTFO) phases. Microstructural analysis shows that densification and grain growth are better at higher sintering temperatures, leading to better coupling between the two phases. Dielectric and ferroelectric studies indicate lossy polarization-electric field (P-E) behaviour due to leakage from the conductive phase, while magnetic properties show increased magnetization with increasing ferrite content. All composites exhibit ME coefficients, which depend on the composition and sintering conditions; the highest ME coefficient (~1.28 mV/cm.Oe) was observed for the 30CTFO - 70BTO composite sintered at 1200 °C. This improvement is due to the optimal balance between magnetostrictive and piezoelectric responses and improved interfacial strain transfer. These results demonstrate that simultaneous optimization of dopant-modified composition and sintering conditions is essential for achieving improved magnetoelectric coupling in bulk multiferroic composites. Moreover, the results demonstrate the potential of lead-free composites for multifunctional device applications in next-generation, low-power technologies, including high-density non-volatile memory (e.g. FeRAM/MRAM), magnetic field sensors, spintronic devices, and actuators.
Comments30 pages, 10 figures
Journal refCeramics International 52, 33321 (2026)
DOI：10.1016/j.ceramint.2026.05.356
