Abstract

Polymer dielectric composites consisting of polytetrafluoroethylene, silicon dioxide and barium titanate mixed in various proportions were successfully synthesized by low-temperature sintering. The structure of the obtained composite samples was studied by the X-ray diffraction, the electron microscopy, and the weight method. Electrical characteristics (dielectric permittivity and losses) of samples were investigated at a frequency of 1 MHz. According to structural analysis, the synthesized samples are a mixture of amorphous polytetrafluoroethylene and silicon dioxide, and crystalline ferroelectric BaTiO₃, the ratio of which determines the electrical properties of the composites. Depending on the content of barium titanate, the studied samples show a permittivity from 4 to 6.5 with a dielectric loss level of 0.06–0.14. It is shown that the significant influence on the dielectric properties of the polytetrafluoroethylene/silicon dioxide/barium titanate system is exerted by heat treatment modes.

中文翻译：

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SiO2和BaTiO3无机填料聚四氟乙烯复合材料

摘要

采用低温烧结的方法成功合成了不同比例的聚四氟乙烯、二氧化硅和钛酸钡组成的聚合物介电复合材料。通过X射线衍射、电子显微镜和重量法研究了所得复合材料样品的结构。在 1 MHz 频率下研究了样品的电气特性（介电常数和损耗）。根据结构分析，合成的样品是非晶态聚四氟乙烯和二氧化硅以及晶态铁电BaTiO ₃的混合物，其比例决定了复合材料的电性能。根据钛酸钡的含量，研究样品的介电常数为 4 至 6.5，介电损耗水平为 0.06-0.14。结果表明，热处理方式对聚四氟乙烯/二氧化硅/钛酸钡体系的介电性能有显着影响。