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首页> 外文期刊>RSC Advances >Magneto-electric/dielectric and fluorescence effects in multiferroic xBaTiO(3)-(1-x) ZnFe2O4 nanostructures
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Magneto-electric/dielectric and fluorescence effects in multiferroic xBaTiO(3)-(1-x) ZnFe2O4 nanostructures

机译：多铁性xBaTiO（3）-（1-x）ZnFe2O4纳米结构的磁电/介电和荧光效应

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摘要

Multiferroic composites of xBaTiO(3)-(1 - x) ZnFe2O4 (BTZF) [x - 0.25 (BTZF2575), 0.35 (BTZF3565), 0.45 (BTZF4555), 0.50 (BTZF5050) and 0.75 (BTZF7525)] nanostructure have been synthesized by a sol-gel method. Different types of nanostructural shapes and sizes have been obtained by the effect of ionic radii, surface energy and poly vinyl alcohol, which enhances the magneto-electric/dielectric interaction between BT/ZF phases. The crystalline phases of BTZF composite are confirmed by X-ray diffraction, and nanostructural dimensions and shape by transmission electron microscopy. The improvement in magnetization of BTZF is dependent upon the size and shape of the nanostructure, stoichiometric ratio and strength of occupation of cations at octahedral and tetrahedral sites. The chemical states of Fe in BTZF are analyzed by X-ray photoelectron spectroscopy. The ferroelectric property is explained by the nano size effect, 1D nanostructure shape, lattice distortion and epitaxial strain between two phases. The magnetoelectric coefficient is measured at room temperature under an applied dc magnetizing field and show different types of behavior in each sample. The magnetocapacitance is measured and explained on the basis of Maxwell-Wagner space charge and magnetoresistance, and relates to theoretical investigation, which proves that the enhancement not only depends on the size/shape of nanostructure but also the strain-induced phase transition where out-of-plane polarization appears in the composite. The photoemission of BTZF is observed by fluorescence spectroscopy.
机译：xBaTiO（3）-（1-x）ZnFe2O4（BTZF）[x-0.25（BTZF2575），0.35（BTZF3565），0.45（BTZF4555），0.50（BTZF5050）和0.75（BTZF7525）]纳米结构的多铁复合材料溶胶-凝胶法。通过离子半径，表面能和聚乙烯醇的作用，获得了不同类型的纳米结构形状和尺寸，这增强了BT / ZF相之间的磁电/介电相互作用。 BTZF复合材料的结晶相通过X射线衍射确认，纳米结构尺寸和形状通过透射电子显微镜确认。 BTZF磁化强度的提高取决于纳米结构的大小和形状，化学计量比和八面体和四面体位点的阳离子占据强度。 X射线光电子能谱分析了BTZF中Fe的化学态。铁电性能通过纳米尺寸效应，一维纳米结构形状，晶格畸变和两相之间的外延应变来解释。磁电系数是在室温下在施加的直流磁化场下测量的，并且在每个样品中显示出不同类型的行为。磁电容是在麦克斯韦-瓦格纳空间电荷和磁阻的基础上进行测量和解释的，并且与理论研究有关，这证明增强不仅取决于纳米结构的尺寸/形状，而且还取决于应变诱发的相变，其中平面极化出现在复合材料中。通过荧光光谱观察到BTZF的光发射。

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