Low-frequency dielectric properties of some organic compounds

Grzegorz W. Bak; Marian Kryszewski

doi:10.1117/12.276250

13 June 1997 Low-frequency dielectric properties of some organic compounds

Grzegorz W. Bak, Marian Kryszewski

Proceedings Volume 3181, Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications; (1997) https://doi.org/10.1117/12.276250
Event: Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications, 1996, Szczyrk, Poland

Abstract

The spectral shape of dielectric response of some solids may be described by equation. The susceptance is related to the dielectric susceptibility by a geometrical factor. Low frequency dispersion (LFD) given by the equation occurs in solids in which the dielectric response is dominated by mobile charge carriers, electrons or ions. Such a type of the dielectric response has been reported to occur in chalcogenide glasses, humid ceramics and humid zeolites. Recently thorough investigations of low-frequency dielectric properties of some low-molecular weigh organic materials has been carried out. LFD has been detected in some of them. It has been shown that LFD is connected with the injection of charge from electrodes. The measurements carried out on the annealed and irradiated samples of these materials and comparison with the results of thermally stimulated currents prove that the observed LFD is related to trapping and detrapping phenomena. Especially well developed LFD has been detected in iodized anthrone which is a charge transfer (CT) complex. The time-domain measurements on the CT complexes also show LFD behavior but the LFD is not as well developed as in the case of iodized anthrone. The results are interpreted by means of injection of charge from electrodes leading to space charge and recombination phenomena. the interpretation is a little similar to the electrochemical model of LFD proposed by Jonscher.

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Grzegorz W. Bak and Marian Kryszewski "Low-frequency dielectric properties of some organic compounds", Proc. SPIE 3181, Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications, (13 June 1997); https://doi.org/10.1117/12.276250

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KEYWORDS

Dielectrics

Electrodes

Solids

Ceramics

Chalcogenide glass

Electrons

Ions

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