Pyroelectric behavior and dielectric properties of linear copolysiloxane/eicosylamine superlattice

Autor:	W.H. Abd. Majid, A. R. M. Yusoff
Rok vydání:	2005
Předmět:	Permittivity Materials science Condensed matter physics Superlattice Relaxation (NMR) Dielectric Atmospheric temperature range Condensed Matter Physics Electronic Optical and Magnetic Materials Pyroelectricity Condensed Matter::Materials Science Dipole Nuclear magnetic resonance Dielectric loss
Zdroj:	The European Physical Journal B. 45:33-37
ISSN:	1434-6036 1434-6028
DOI:	10.1140/epjb/e2005-00161-0
Popis:	The pyroelectric behavior and dielectric properties of a superlattice containing a Langmuir-Blodgett (LB) film of alternately monomeric eicosylamine and linear copolysiloxane substituted with aromatic acid side chains have been investigated in the temperature range of \(13 - 29~^\circ\)C. The pyroelectric coefficient of the superlattice increases with temperature, exhibiting the highest coefficient of 6.2 ± 0.2\(~\mu\,\)cm\(^{-2}~\)K-1 at 29 °C. The dielectric behavior of the superlattice is investigated by examining the dielectric loss and capacitance in the frequency range of 102 to 105 Hz. The maximum loss values for all temperatures in the range occur at a frequency ∼5000 Hz which correspond to a relaxation time of 3.18 × 10-5 s. The Cole-Cole plots obtained experimentally are found to be broad and fall inside the semicircle derived from the Debye relaxation theory. However, they agree fit with the semi-empirical Cole-Cole relaxation model. The parameter α obtained from the Cole-Cole relaxation model decreases with temperature indicating the rise in the internal degrees of freedom of the dipole in the superlattice.
Databáze:	OpenAIRE
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