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Dielectric and pyroelectric properties of BaTiO 3 –PVC composites
Author(s) -
Olszowy M.,
Pawlaczyk Cz.,
Markiewicz E.,
Kułek J.
Publication year - 2005
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200420037
Subject(s) - pyroelectricity , materials science , dielectric , composite material , ceramic , barium titanate , volume fraction , relaxation (psychology) , polymer , permittivity , ferroelectricity , psychology , social psychology , optoelectronics
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)