In this work, three phase magnetoelectric nanocomposites are successfully prepared by solvent casting from α-PVDF. The extrinsic piezoelectric effect is insured by 20 vol% of NaNbO3 ferroelectric nanoparticles prepared by the hydrothermal process. Nickel is chosen as the magnetic phase. In order to maintain insulation, electrical percolation is avoided by using nickel contents lower than the percolation threshold. Two different morphologies are employed: spherical nanoparticles (NiNPs) and nanochains (NNCs) with an aspect ratio of 80. NNCs are obtained by a polyol process under a magnetic field. Thin films of nanocomposites are processed by hot pressing. The real part of the dielectric permittivity (ε') of composites is governed by Maxwell-Wagner-Sillars polarization at the PVDF/Ni interfaces. An important increase of ε' at low frequency is observed for PVDF/NaNbO3/NNCs composites; it favors the magnetoelectric coupling. Piezoelectric properties of composites are dependent upon mechanical modulus so that the most higher d33 is obtained for PVDF / NaNbO3 / NiNPs. Magnetoelectric coupling coefficient (αME) is determined from magnetoelectric intensity. PVDF / NaNbO3 / NiNPs composites exhibit enhanced magnetoelectric coupling. The aME coupling coefficient reaches 4.2V/(mOe). The magnetic properties are significantly improved by the NiNPs

中文翻译：

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PVDF/Nano NaNbO3/NanoNi 复合材料中的磁电耦合：Ni 颗粒纵横比的影响

在这项工作中，三相磁电纳米复合材料通过溶剂浇铸从 α-PVDF 成功制备。通过水热法制备的 20 vol% NaNbO3 铁电纳米粒子确保了外在压电效应。选择镍作为磁相。为了保持绝缘，通过使用低于渗透阈值的镍含量来避免电渗透。采用了两种不同的形态：球形纳米粒子 (NiNPs) 和纵横比为 80 的纳米链 (NNCs)。NNCs 是在磁场下通过多元醇工艺获得的。通过热压加工纳米复合材料的薄膜。复合材料介电常数 (ε') 的实部由 PVDF/Ni 界面处的 Maxwell-Wagner-Sillars 极化控制。ε'的重要增加 在低频下观察到 PVDF/NaNbO3/NNCs 复合材料；它有利于磁电耦合。复合材料的压电性能取决于机械模量，因此 PVDF / NaNbO3 / NiNPs 可获得最高的 d33。磁电耦合系数 (αME) 由磁电强度确定。PVDF / NaNbO3 / NiNPs 复合材料表现出增强的磁电耦合。aME耦合系数达到4.2V/(mOe)。NiNPs显着改善了磁性 PVDF / NaNbO3 / NiNPs 复合材料表现出增强的磁电耦合。aME耦合系数达到4.2V/(mOe)。NiNPs显着改善了磁性 PVDF / NaNbO3 / NiNPs 复合材料表现出增强的磁电耦合。aME耦合系数达到4.2V/(mOe)。NiNPs显着改善了磁性