Please use this identifier to cite or link to this item: http://localhost:8080/xmlui/handle/123456789/71
Title: Low dielectric loss polytetrafluoroethylene / TeO2 polymer ceramic composites
Authors: Subodh, G
Joseph, M
Mohanan, P
Sebastian, M T
Keywords: Polytetrafluoroethylene
Polymer ceramic composites
Dielectric constant
Issue Date: Nov-2007
Publisher: American Ceramic Society, USA
Citation: Journal of the American Ceramic Society 90(11):3507-3511; Nov 2007
Abstract: TeO2 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 TeO2 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 TeO2 content. For 60 vol% of TeO2 the composite has a dielectric constant of 5.4 and a loss tangent of 0.006 at 7 Ghz. The measured dielectric constant (Epsilon 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 TeO2 content, reaching a minium of 32 ppm/C for 60 vol% loading.
URI: http://hdl.handle.net/123456789/71
Appears in Collections:2007

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