E. Ramana, M. Graça, J. Monteiro, S. Mendiratta, M. Valente
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引用次数: 2
摘要
采用常规陶瓷法制备了(Na0.5Bi0.5TiO3)-BaTiO3(NBBT)+(Co0.6Zn0.4)(Fe1.7Mn0.3)O4 (CZFMO)颗粒复合材料，研究了其铁电、磁性和磁电性能。在所有的铁电陶瓷和复合陶瓷中都可以看到铁电开关。纯NBT-BT陶瓷和85 mol% NBT-BT陶瓷的剩余极化为34 μ c /cm2和26μC/cm2，剩余材料的漏电流较大。在铁电含量为65%的陶瓷中，磁电系数(αME)为8 mV/cm-Oe，铁电含量越高，耦合越小。在65 mol% NBBT的复合材料中观察到饱和磁化强度变化约10%，这表明存在逆磁电效应。结果表明，这些无铅复合材料具有良好的应用前景，可用于低场磁电应用。
Improved magnetoelectric effect in modified (Na0.5Bi0.5)TiO3-BaTiO3-CoFe2O4 lead-free multiferroic composites
Particulate composites of (Na0.5Bi0.5TiO3)-BaTiO3(NBBT)+(Co0.6Zn0.4)(Fe1.7Mn0.3)O4 (CZFMO) were synthesized by the conventional ceramic method to study ferroelectric, magnetic and magnetoelectric properties. Ferroelectric switching has been seen in all the ferroelectric and composite ceramics. Remanent polarization of 34 and 26μC/cm2 was obtained for the pure and 85 mol% NBT-BT ceramics, while a larger leakage current was observed for the remaining composites. The magnetoelectric coefficient (αME) of 8 mV/cm-Oe was observed in the composition with 65 mol% ferroelectric and the coupling seems to be lower for higher ferroelectric content ceramics. A change of ~10% in saturated magnetization was observed in composites of 65 mol% NBBT, which is an indication of the converse magnetoelectric effect. The results indicate that these lead-free composites are promising and can be tunable for the low-field magnetoelectric applications.
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