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- W2227335952 abstract "Ceramic-polymer composites with different compositions have been prepared andtheir electrical properties (absorption current, quasi-steady-state conduction current,dielectric and pyroelectric behaviour) have been studied. In addition, similarmeasurements have been made on a commercially available ceramic-polymercomposite, PIEZEfM. The ceramics used include Lead Zirconate Titanate (PZT) andBarium Titanate (BaTi03) while the polymers were Polyvinylidene Fluoride (pVDF),copolymer of Vinylidene Fluoride-Trifluoroethylene (VDF-TrFE) and Polypropylene(PP). Analysis of data revealed that the process of charging and discharging currentsof the composites involves charge carrier hopping through localised states (trappingsites) distributed throughout the bulk whereas the steady-state electrical conductionin these composites may originate from an ionic hopping mechanism.Dielectric properties of the composites in the frequency range of 10Hz to 100KHzhave been measured using an a.c. bridge technique. Results show that the dielectricloss process is dominated by the polymer phase whereas the ceramic phase mayhave a significant contribution at low frequencies and high temperatures. With theincrease of ceramic content in the composite, dielectric permittivity and loss wereobserved to increase. Measured dielectric permittivities of the composites weregenerally in agreement with the calculated values.The pyroelectric activity of the composites has been measured by the directmethod. For samples with a high content of ceramic phase, calculated pyroelectriccoefficient data appear to be comparable to those observed. The inherent highpyroelectric activity of the composites is essentially due to the ceramic phase whilethe high dielectric permittivity of the polymer is required to maintain a large dielectricdisplacement flux in the medium. Higher pyroelectric activity has been achieved inPZfSNDF-TrFE (or PZTS/PVDF) composites in comparison with that of the othercomposites in the present work. The pyroelectric figure of merit in these particularcomposites was found to be about four times higher than that of the single phaseceramic." @default.
- W2227335952 created "2016-06-24" @default.
- W2227335952 creator A5008351836 @default.
- W2227335952 date "1990-01-01" @default.
- W2227335952 modified "2023-09-28" @default.
- W2227335952 title "A study of electro-active properties of polymer/ceramic comosites" @default.
- W2227335952 hasPublicationYear "1990" @default.
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