Magnetic, Ferroelectric, and Magnetocapacitive Properties of Sonochemically Synthesized Sc-Doped BiFeO3 Nanoparticles
Magnetic, Ferroelectric, and Magnetocapacitive Properties of Sonochemically Synthesized Sc-Doped BiFeO3 Nanoparticles
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DOI：
10.1021/jp310710p
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发表时间：
2013-02-07
影响因子：
3.7
通讯作者：
Tyagi, Avesh K.
中科院分区：
文献类型：
--
作者：
Dutta, Dimple P.;Mandal, Balaji P.;Tyagi, Avesh K.
我们报告的合成未掺杂和Sc 3+掺杂的BiFeO 3纳米粒子使用声化学技术。X-射线衍射表明，所有样品均为单相，未检测到杂质。进行EDX分析以确认样品中Sc 3+掺杂的程度。使用透射电子显微镜（TEM）的纳米粒子的尺寸和形态进行了分析。进行XPS研究以检查样品中Fe 2+离子的存在。BiFeO 3纳米颗粒在室温下表现出弱铁磁行为，这与大块BiFeO 3的线性M-H关系有很大不同。Sc离子取代Bi增强了该体系的铁磁和铁电性质，这主要归因于纳米颗粒的反铁磁核和铁磁表面，以及轻微的结构畸变。磁化曲线的温度和磁场依赖性揭示了该系统的阻挫磁行为。的漏电流大大减少，和电极化的情况下，BiFe 0.95Sc 0.05 O3纳米粒子显着增加。在BiFe_（0.95）Sc_（0.05）O_3样品中观察到了磁电耦合。因此，可以推断，Sc 3+掺杂的BiFeO 3纳米粒子显示出良好的多铁性材料的前景。
We report the synthesis of undoped and Sc3+-doped BiFeO3 nanoparticles using the sonochemical technique. X-ray diffraction reveals that all samples are single phase with no impurities detected. EDX analysis was done to confirm the extent of Sc3+ doping in the samples. The size and morphology of the nanoparticles have been analyzed using transmission electron microscopy (TEM). XPS studies were done to check the presence of Fe2+ ions in the samples. The BiFeO3 nanoparticles show a weak ferromagnetic behavior at room temperature, which is quite different from the linear M-H relationship reported for bulk BiFeO3. The substitution of Sc ions for Bi enhances the ferromagnetic as well as ferroelectric properties of this system, which is mainly attributed to the antiferromagnetic core and ferromagnetic surface of the nanoparticles, together with the mild structural distortion. Temperature and field dependence of magnetization curves reveal the frustrated magnetic behavior of this system. The leakage current is considerably reduced, and electric polarization increases significantly in the case of BiFe0.95Sc0.05O3 nanoparticles. Magnetoelectric coupling was observed in the BiFe0.95Sc0.05O3 sample. Thus, it can be inferred that Sc3+-doped BiFeO3 nanoparticles show promise as good multiferroic materials.