Study of pyroelectric activity of PZT/PVDF-HFP composite
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Data
2003-12
Autores
Malmonge, Luiz Francisco [UNESP]
Malmonge, José Antonio [UNESP]
Sakamoto, Walter Katsumi [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
ABM, ABC, ABPol
Resumo
Flexible, free-standing piezo and pyroelectric composite with 0 to 3 connectivity was made up from Lead Zirconate Titanate (PZT) powder and poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) copolymer. The pyroelectric and the piezoelectric longitudinal (d33) coefficients were measured. A 50/50 vol.% PZT/PVDF-HFP composite resulted in piezo and pyroelectric coefficients of d33 = 25.0 pC/N and p = 4.5 × 10-4 C/m²K at 70 °C, respectively. Analysis of the complex permittivity in a wide range of frequency was carried out indicating lower permittivity of the composite in comparison with a permittivity of the PZT ceramic. The low value of the permittivity gives a high pyroelectric figure of merit indicating that this material can be used to build a temperature sensor in spite of the lower pyroelectric coefficient compared with PZT.
Descrição
Palavras-chave
composite piezoelectric, permittivity, thermally stimulated current, thermal sensors
Como citar
Materials Research. São Carlos, SP, Brazil: ABM, ABC, ABPol, v. 6, n. 4, p. 469-473, 2003.