Dielectric Properties of Polymer/Ferroelectric Ceramic Composites From 100 Hz to 10 GHz

Published

August 1, 2001

Author(s)

R Popielarz, C. K. Chiang, R Nozaki, Jan Obrzut

Abstract

Dielectric properties of model BaTiO₃/polymer composites were measured over a broad frequency and temperature range. A series of BaTiO₃/monomer suspensions were photocured into thin wafers. The wafers were equipped with aluminum electrodes and the dielectric permittivity of the composites were investigated at frequencies from 100 Hz to 10 GHz and at temperatures from -140 to +150 C. It has been found that for the same BaTiO₃ loading dielectric characteristics of the composites strongly depend on the type of polymer. Polar polymers increase dielectric constant of the composites at low frequencies but have little effect at gigahertz frequencies. Dielectric losses of the composites show a maximum at some intermediate frequency within metahertz to gigahertz range that reflects the relaxation behavior of the polymer matrix. The magnitude of the losses increases with increasing polarity of the polymer component. At constant frequency and temperature, the composites follow a linear relationship between logarithm of their dielectric constant and volume fraction of the ferroelectric filter. Practical implications of such composites behavior are discussed.

Citation

Macromolecules

Volume

No. 34

Issue

No. 17

Pub Type

Journals

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Keywords

BaTiO3, dielectric constant, ferroelectric, film, frequency, photo, polymer composite, powder, temperature

Citation

Popielarz, R. , Chiang, C. , Nozaki, R. and Obrzut, J. (2001), Dielectric Properties of Polymer/Ferroelectric Ceramic Composites From 100 Hz to 10 GHz, Macromolecules, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851772 (Accessed December 8, 2024)