Use este identificador para citar ou linkar para este item: http://www.repositorio.ufc.br/handle/riufc/2552
Título: Structural properties of CaTi1-x(Nb2/3Li2/3)xO3-ᵹ (CNLTO) and CaTi1-x(Nb1/2Ln1/2)xO3 (Ln = Fe(CNFTO), Bi(CNBTO)), modified dielectric ceramics for microwave applications
Autor(es): Costa, R.C.S
Costa, Antonia Daniele Souza Bruno
Freire, Francisco Nivaldo Aguiar
Santos, Manoel Roberval Pimentel
Almeida, José Silva de
Sohn, Ricardo Sávio Teixeira Moretz
Sasaki, Jose Marcos
Sombra, Antonio Sergio Bezerra
Palavras-chave: Microondas
Antenas
Data do documento: 2009
Editor: Elsevier
Citação: COSTA, R. C. S. ; COSTA, A. D. S. B. ; FREIRE, F. N. A. ; SANTOS, M. R. P. ; ALMEIDA, J. S. ; SOHN, R. S. T. M. ; SASAKI, J. M. ; SOMBRA, A. S. B. (2009)
Abstract: This paper presents an investigation of the structural characteristics of Nb1/2Bi1/2 (CNBTO), Nb1/2Fe1/2 (CNFTO) and Nb2/3Li1/3 (CNLTO) substitution into the B-site of calcium titanate ceramics. The modified CaTiO3 (CTO) ceramics were prepared by the conventional solid-state method. The compounds were investigated, by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDXS). The X-ray analysis shows that all samples have an orthorhombic structure. The refinement analysis of all samples were also performed and discussed in this paper. For all studied samples, a Raman mode at 805 cm−1 was detected and its intensity increases as the substitution increases. The dielectric permittivity and loss at microwave frequencies (MW) were investigated. The CNLTO phase, present the highest dielectric constant (k=35.8) at 3.9 GHz with loss (tg α=7×10−3). The lowest value of k=25.7 (f=4.8 GHz) and tg α=3×10−3, was obtained for the CNFTO phase. These measurements confirm the possible use of such material for microwave devices like dielectric resonator antennas.
Descrição: COSTA, R. C. S. et al. Structural properties of CaTi1-x(Nb2/3Li2/3)xO3-ᵹ(CNLTO)and CaTi1-x(Nb1/2Ln1/2)xO3 (Ln=Fe(CNFTO),Bi(CNBTO)),modified dielectric ceramics for microwave applications. Physica B, v. 404, p. 1409-1414, 2009.
URI: http://www.repositorio.ufc.br/handle/riufc/2552
ISSN: 0921-4526
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