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Enhanced magnetoelectric coupling in environmental friendly lead-free Ni0.8Zn0.2Fe2O4–Ba0.85Ca0.15Zr0.1Ti0.9O3 laminate composites
Journal of Materials Science: Materials in Electronics ( IF 2.8 ) Pub Date : 2021-09-20 , DOI: 10.1007/s10854-021-07012-z
Pankhuri Bansal 1 , Rajat Syal 1 , Sanjeev Kumar 1 , Arun Kumar Singh 2
Affiliation  

Lead-free piezomagnetic–piezoelectric, Ni0.8Zn0.2Fe2O4(NZFO)–Ba0.85Ca0.15Zr0.1Ti0.9O3(BCZT) laminate composites featuring improved magnetoelectric (ME) properties are reported. The solid-state method has been used for the synthesis of NZFO and BCZT. Sintered layers were laminated using silver epoxy with a 2–2 connectivity scheme. The refined profiles of X-ray diffraction patterns support the coexistence of tetragonal and rhombohedral phases in BCZT and spinel cubic phase in NZFO. Scanning electron microscopy with elemental mapping revealed prepared sample's surface morphology and chemical composition. BCZT exhibited a high value of dielectric constant at TC (ɛ ~ 11,200 at 100 Hz), the significant value of electromechanical coupling factor (KP ~ 51.2%), and well-saturated polarization (P) vs applied electric field (E) loops. Ferri-magnetic NZFO also exhibits a large value of saturation magnetization (MS ~ 62.10 emu/g), and plot between the derivative of the square of magnetization (dM2/dH) vs applied magnetic field (H) follows the same trend as that of observed field-dependent ME coupling coefficient for layered composites. The layered composites demonstrated low leakage current and high dielectric constant, which further favours stronger ME coupling. At lower magnetic fields, tri-layer (NZFO/BCZT/NZFO) and bi-layer (BCZT/NZFO) laminate composites respond with ME coupling coefficients αME ~ 600 mV/cm-Oe and 128 mV/cm-Oe, respectively, making them excellent lead-free material for future multifunctional devices.



中文翻译:

环保无铅Ni0.8Zn0.2Fe2O4–Ba0.85Ca0.15Zr0.1Ti0.9O3层压复合材料中增强的磁电耦合

无铅压电-压电,Ni 0.8 Zn 0.2 Fe 2 O 4 (NZFO)-Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3(BCZT) 层压复合材料具有改进的磁电 (ME) 性能。固态方法已用于合成 NZFO 和 BCZT。使用具有 2-2 连接方案的银环氧树脂层压烧结层。X 射线衍射图的精细轮廓支持 BCZT 中的四方和菱面体相和 NZFO 中的尖晶石立方相共存。具有元素映射的扫描电子显微镜揭示了制备的样品的表面形态和化学成分。BCZT 在T C ( ɛ  ~ 11,200 at 100 Hz)、机电耦合因子的显着值 ( K P  ~ 51.2%) 和饱和极化 ( P) 与外加电场 ( E ) 回路。铁淦氧磁性NZFO也表现出饱和磁化强度的较大的值(中号小号 〜62.10鸸鹋/ g),以及所述衍生物磁化(d的平方之间情节中号2 / d ħ)与施加的磁场(H ^)遵循相同的作为观察到的层状复合材料的场相关 ME 耦合系数的趋势。层状复合材料表现出低漏电流和高介电常数,这进一步有利于更强的 ME 耦合。在较低磁场下,三层 (NZFO/BCZT/NZFO) 和双层 (BCZT/NZFO) 层压复合材料响应 ME 耦合系数α ME ~ 600 mV/cm-Oe 和 128 mV/cm-Oe,分别使它们成为未来多功能设备的优秀无铅材料。

更新日期:2021-09-21
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