The percolation behaviour and dielectric properties of La_2−xSr_xNiO₄ (LSNO)/poly(vinylidene fluoride) (PVDF) composites with different Sr doping concentrations were investigated. The semiconducting LSNO filler particles with x = 0.2 (LSNO-1) and x = 0.4 (LSNO-2) were prepared using a chemical combustion method. The microstructures, thermal properties, and phase compositions of the polymer composites and filler particles were systematically investigated. The conductivity of the LSNO fillers increased with the Sr content and had an important impact on the dielectric properties of the LSNO/PVDF composites. The percolation threshold of the LSNO-2/PVDF composite was lower than that of the LSNO-1/PVDF composite. An ultra-high dielectric permittivity (ε′) of 3384.7 (at 1 kHz and room temperature), which was approximately 340 times higher than that of pure PVDF, was obtained for the LSNO-2/PVDF composite with a filler volume fraction of 25 vol%. The enhanced dielectric properties were attributed to interfacial polarisation at the semiconductor–insulator interface, a micro-capacitor model, and the intrinsically remarkable dielectric properties of the LSNO ceramic.

中文翻译：

---

不同 Sr 掺杂浓度的 La2−xSrxNiO4/聚偏氟乙烯复合材料的介电常数和渗透行为显着增强

_{研究了不同Sr掺杂浓度的La 2− x} Sr _x NiO ₄ (LSNO)/聚偏二氟乙烯(PVDF)复合材料的渗流行为和介电性能。x = 0.2 (LSNO-1) 和x的半导体 LSNO 填料颗粒= 0.4 (LSNO-2) 是使用化学燃烧法制备的。系统地研究了聚合物复合材料和填料颗粒的微观结构、热性能和相组成。LSNO填料的电导率随着Sr含量的增加而增加，对LSNO/PVDF复合材料的介电性能有重要影响。LSNO-2/PVDF 复合材料的渗流阈值低于 LSNO-1/PVDF 复合材料。超高介电常数 ( ε'）为 3384.7（在 1 kHz 和室温下），比纯 PVDF 高约 340 倍，填充体积分数为 25 vol% 的 LSNO-2/PVDF 复合材料获得。增强的介电性能归因于半导体-绝缘体界面处的界面极化、微电容器模型以及 LSNO 陶瓷固有的显着介电性能。