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, Rodrigo Carvalho Souza
Costa, Antônia Daniele Souza Bruno
Freire, Francisco Nivaldo Aguiar
Santos, Manoel Roberval Pimentel
Almeida, José Silva de
Sohn, Ricardo Sávio Teixeira Moretz
Sasaki, José Marcos
Sombra, Antônio Sérgio 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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