Composite Materials Based on Polytetrafluoroethylene with SiO2 and BaTiO3 Inorganic Fillers

• Published in: Glass physics and chemistry Vol. 49; no. Suppl 1; pp. S94 - S101
• Main Authors: Tumarkin, A. V., Tyurnina, N. G., Tyurnina, Z. G., Sinelshchikova, O. Y., Tsygankova, D. I., Gagarin, A. G., Karamov, A. R., Bogdan, A., Balabanova, E. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-12-2023; Springer Nature B.V
• Subjects: Barium titanates; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composite materials; Composites; Dielectric loss; Dielectric properties; Electrical properties; Ferroelectricity; Glass; Heat treatment; Low temperature; Materials Science; Natural Materials; Permittivity; Physical Chemistry; Polytetrafluoroethylene; Silicon dioxide; Structural analysis; Synthesis; barium titanate; high frequency applications; silicon dioxide; polymer dielectric composites
• ISSN: 1087-6596; 1608-313X
• DOI: 10.1134/S1087659623601089

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 BaTiO
3
, 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.