Abstract
A study on polytetrafluoroethylene (PTFE) filled with Li2SnMg0.5O3.5 (LSMO) composite substrates were discussed in this paper. LSMO complex phase ceramics were synthesized using atmosphere-controlled sintering approach, modified by C14H19F13O3Si and then loaded in PTFE suspension with different weight fraction (30–70 wt%). The spectra of TEM and XRD were performed to characterize the microscopic crystal structure of LSMO particles, while the Contact Angle of water droplet and the analysis of XPS were drawn to investigate the surface states of LSMO. Further, TEM images and cross sectional SEM images were enclosed to study the microstructure of PTFE/LSMO composites. Several theoretic models were discussed and compared with experimental dielectric constant of fabricated composites indicating that the experiments were reliable and calculable. Among these models, Modified Lichtenecker was consistent with experimental data by reminding the percentage deviation below 2%. At last, PTFE/LSMO composites filled with 70 wt% LSMO possessed excellent dielectric properties of εr = 4.97 and tan δ = 0.0026.
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