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Dielectric and pyroelectric properties of BaTiO3-PVC composites

✍ Scribed by Olszowy, M. ;Pawlaczyk, Cz. ;Markiewicz, E. ;Kułek, J.

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
237 KB
Volume
202
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

Dielectric relaxation and pyroelectric response of the barium titanate–poly (vinyl chloride) BaTiO~3~–PVC composites of 0–3 connectivity and volume fraction of ceramics ϕ from 0.0 to 0.4 were investigated. Dielectric properties of the composites were found to be a combination of those of pure PVC polymer and BaTiO~3~ ceramics: the value of dielectric permittivity increases with increasing volume fraction of the ceramics but the temperature dependence is determined by two relaxation processes in the polymer (at ∼270 K – the local motion of the small groups in the chain and at ∼350 K – the segmental molecular motion) and in the ceramics (dielectric anomaly at the phase transitions). The value of the pyroelectric coefficient p of poled composites increases with ϕ and depends on the light modulation frequency f~m~ as p ∼ f^–n^~m~ with n ≈ 0.9 to 1.1, dependently on ϕ. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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