Premium
Low Dielectric Loss Polytetrafluoroethylene/TeO 2 Polymer Ceramic Composites
Author(s) -
Subodh Ganesanpotti,
Joseph Manoj,
Mohanan Pezholil,
Sebastian Mailadil Thomas
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01914.x
Subject(s) - dielectric , composite material , materials science , dielectric loss , ceramic , microstructure , dissipation factor , composite number , volume fraction , scanning electron microscope , thermal expansion , high κ dielectric , optoelectronics
TeO 2 particle‐filled PTFE composites were prepared by the powder processing technique. The structure and microstructure of the composites were investigated by X‐ray diffraction and scanning electron microscopic methods. The effect of the ceramic content (0–0.6 volume fraction) of TeO 2 on the dielectric properties of the composites was studied at 1 MHz and 7 GHz. The dielectric constant and dielectric loss increased with an increase in the TeO 2 content. For 60 vol% of TeO 2 , the composite has a dielectric constant of 5.4 and a loss tangent of 0.006 at 7 GHz. The measured dielectric constant (ɛ r ) is compared with the effective dielectric constant calculated using different theoretical models. The observed dielectric constants are in agreement with that calculated using effective medium theory. The coefficient of thermal expansion of the composites decreases with the TeO 2 content, reaching a minimum of 32 ppm/°C for 60 vol% loading.