Abstract A three-dimensional network structure of BaTiO3 (3D-BTO) ceramic was constructed using cellulose sponge as a template at 1200 °C. The 3D-BTO/epoxy composites were prepared at various BTO contents of 5, 7, and 10 vol%. The dielectric constant and tanδ of the composites increased as the BTO content increased. With a BTO content of 10 vol%, the dielectric constant and discharged energy density were 42.0 at 1 MHz and 1.57 mJ/cm3 at 25 kV/cm, respectively. However, tanδ and energy loss density were larger. The enhancement of dielectric constant and discharge energy density at low BTO content (10 vol%) was attributable to a continuous 3D network structure of BTO phase in the composites.

中文翻译：

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具有3D BaTiO3网络结构的环氧复合材料的介电性能和放电能量密度

摘要 以纤维素海绵为模板，在1200℃下构建了BaTiO3（3D-BTO）陶瓷的三维网络结构。以 5、7 和 10 vol% 的各种 BTO 含量制备 3D-BTO/环氧树脂复合材料。随着 BTO 含量的增加，复合材料的介电常数和 tanδ 增加。BTO 含量为 10 vol% 时，1 MHz 下的介电常数和放电能量密度分别为 42.0 和 25 kV/cm 下的 1.57 mJ/cm3。然而，tanδ和能量损失密度更大。在低 BTO 含量（10 vol%）下介电常数和放电能量密度的提高归因于复合材料中 BTO 相的连续 3D 网络结构。