High Frequency Dielectric Relaxation in Polymers Filled With Ferroelectric Ceramics

Published

June 1, 2002

Author(s)

N Noda, Jan Obrzut

Abstract

We investigated the dielectric relaxation process in high-dielectric constant polymer composite films filled with barium titanate particles. In order to extend the dielectric measurements to the microwave range, we employed a new broadband measurement technique where a thin film capacitance terminating a coaxial waveguide is treated as a transmission line. The complex permittivity measured at frequencies of 100 Hz to 10 GHz for several films 50 m to 100 m thick, with a dielectric constant of 3.2 to 30, was fitted to a dielectric model expressed as a superposition of Havriliak-Negami functions. An intrinsic high frequency relaxation process has been identified. It was found that the position of the loss peak depends primarily on the relaxation of the polymer matrix, while its magnitude is amplified by the volume fraction and permittivity of the ferroelectric component.

Proceedings Title

Electroactive Polymers and Their Applications as Actuators, Sensors, and Artificial Muscles; Electroactive Polymers and Rapid Prototyping, Symposium EE | | Electroactive Polymers and Rapid Prototyping | Materials Research Society

Volume

46(2)

Conference Dates

November 26-30, 2001

Conference Title

Materials Research Society Symposium Proceedings

Pub Type

Conferences

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Keywords

dielectric relaxation, high dielectric constant films, high frequency measurements, polymer composites

Citation

Noda, N. and Obrzut, J. (2002), High Frequency Dielectric Relaxation in Polymers Filled With Ferroelectric Ceramics, Electroactive Polymers and Their Applications as Actuators, Sensors, and Artificial Muscles; Electroactive Polymers and Rapid Prototyping, Symposium EE | | Electroactive Polymers and Rapid Prototyping | Materials Research Society, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851977 (Accessed April 26, 2024)