This manuscript aims to investigate the structural, thermal, and dielectric properties of polyester/Ni0.5Zn0.5Fe2O4 nanocomposites. The synthesized samples were characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR), field emission scanning electron microscope, transmission electron microscope (TEM), thermogravimetric analysis (TGA), and dielectric measurements. The XRD patterns confirmed the existence of both polyester and Ni0.5Zn0.5Fe2O4 nanoparticles peaks. FTIR analysis confirmed the incorporation of Ni0.5Zn0.5Fe2O4 nanoparticles into the polyester matrix in agreement with XRD results. SEM micrographs showed distribution of nanoparticles inside the polymer and TEM image showed a little agglomeration of Ni0.5Zn0.5Fe2O4 with flake-like micrometer-sized particles. The incorporation of nanofiller into the polymer increases the thermal stability as the weight losses reduced with nanoparticles content. Dielectric analysis depicted the enhancement in both real and imaginary parts of permittivity when nanoparticles concentration increased. Additionally, the AC conductivity increased while the electric impedance decreased with increasing Ni0.5Zn0.5Fe2O4 concentration.

中文翻译：

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含有纳米 Ni0.5Zn0.5Fe2O4 的聚酯纳米复合材料的微观结构、热和介电性能

本手稿旨在研究聚酯/Ni0.5Zn0.5Fe2O4 纳米复合材料的结构、热和介电性能。合成的样品使用 X 射线衍射 (XRD)、傅里叶变换红外 (FTIR)、场发射扫描电子显微镜、透射电子显微镜 (TEM)、热重分析 (TGA) 和介电测量进行表征。XRD 图案证实了聚酯和 Ni0.5Zn0.5Fe2O4 纳米粒子峰的存在。FTIR 分析证实了 Ni0.5Zn0.5Fe2O4 纳米颗粒掺入聚酯基体中，与 XRD 结果一致。SEM 显微照片显示纳米粒子在聚合物内部的分布，TEM 图像显示 Ni0.5Zn0.5Fe2O4 与片状微米级粒子有少量团聚。将纳米填料掺入聚合物可提高热稳定性，因为随着纳米颗粒含量的增加，重量损失减少。介电分析描述了当纳米粒子浓度增加时介电常数实部和虚部的增强。此外，随着 Ni0.5Zn0.5Fe2O4 浓度的增加，交流电导率增加而电阻抗降低。