Use este identificador para citar ou linkar para este item: http://www.repositorio.ufc.br/handle/riufc/2604
Título: Studies of the temperature coefficient of capacitance (TCC) of a new electroceramic composite: Pb(Fe0.5Nb0.5)O3 (PFN)–Cr0.75Fe1.25O3(CRFO)
Autor(es): Freire, Francisco Nivaldo Aguiar
Santos, Manoel Roberval Pimentel
Pereira, Francisca Maria Martins
Sohn, Ricardo Sávio Teixeira Moretz
Almeida, José Silva de
Medeiros, A. M. L.
Sancho, Emmanuelle de Oliveira
Costa, Mauro Miguel
Sombra, Antonio Sergio Bezerra
Palavras-chave: Coeficiente de temperatura
Data do documento: 2009
Editor: Journal of Materials Science
Citação: FREIRE, F. N. A. ; SANTOS, M, R. P. ; PEREIRA, F. M. M. ; SOHN, R. S. T. M. ; ALMEIDA, J. S. ; MEDEIROS , A. M. L. ; SANCHO, E. O. ; COSTA, M. M. ; SOMBRA, A. S. B. (2009)
Abstract: In this paper we did a study of the dielectric properties: capacitance (C), dielectric permittivity(e), electric modulus(M) and dielectric loss(tanga)) in the radiofrequency(RF) and microwave (MW) frequency range as a function of temperature and the temperature coefficient of capacitance (TCC) of the composites [Pb(Fe1/2Nb1/2)O3 (PFN)]Z–[CrYFe2 O3(CRFO)]100-Z where Z = 0, 10, 50, 90 and 100%. The compounds were prepared by the powdersintering and the X-ray diffraction (XRD) was used in this study using the Rietveld procedure. The X-ray analysis shows that PFN phase is tetragonal where the CRFO phase belongs to a trigonal structure. The capacitance, dielectric permittivity, electric modulus and loss were studied in the frequency range of 100 Hz to 1GHz and temperature range of 25–100 C. The values of TCC for all the samples are presenting positive values. The study of the electric modulus (M) as a function of frequency and temperature lead to the measurement of the activation energy (Eac), which is directed linked to the relaxation process associated to the interfacial polarization effect in the samples. The study of the electrical properties in the RF andMWrange of frequencies is important in view of possible applications of these composites as future components in RF and MW circuits.
Descrição: FREIRE, F. N. A. et al. Studies of the temperature coefficient of capacitance (TCC) of a new electroceramic composite: Pb(Fe0.5Nb0.5)O3 (PFN)–Cr0.75Fe1.25O3(CRFO). Journal of Materials Science. v. 20, p. 149-156, 2009.
URI: http://www.repositorio.ufc.br/handle/riufc/2604
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