J
J.S. Almeida
Researcher at Federal University of Ceará
Publications - 8
Citations - 174
J.S. Almeida is an academic researcher from Federal University of Ceará. The author has contributed to research in topics: Dielectric & Dielectric loss. The author has an hindex of 6, co-authored 8 publications receiving 157 citations.
Papers
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Journal ArticleDOI
Study of the structural, dielectric and magnetic properties of Bi2O3 and PbO addition on BiFeO3 ceramic matrix
H. O. Rodrigues,G.F.M. Pires Junior,J.S. Almeida,E. O. Sancho,A. C. Ferreira,Marcelo Antônio Santos Da Silva,Antonio Sergio Bezerra Sombra +6 more
TL;DR: In this paper, the structural, dielectric and magnetic properties of fifteen BFO samples were discussed in view of possible applications in RF and microwave devices, where polyvinyl alcohol (PVA) and tetraethyl orthosilicate (TEOS) were also added as a binder in fabrication procedure.
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Study of the dielectric and magnetic properties of Co2Y, Y-type hexaferrite (Ba2Co2Fe12O22) added with PbO and Bi2O3 in the RF frequency range
G. F. M. Pires,H.O. Rodrigues,J.S. Almeida,E. O. Sancho,J.C. Góes,Marcos Mota do Carmo Costa,Juliano C. Denardin,Antonio Sergio Bezerra Sombra +7 more
TL;DR: In this article, the magnetic and dielectric properties of Y-type hexaferrite (Co2Y:Ba2Co2Fe12O22) added with 3, 5 and 10% of PbO and Bi2O3, obtained in a new procedure of the solid-state method, is presented.
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Copper concentration effect in the dielectric properties of BiNbO4 for RF applications
A. J. M. Sales,P.W.S. Oliveira,J.S. Almeida,Marcos Mota do Carmo Costa,H. O. Rodrigues,Antonio Sergio Bezerra Sombra +5 more
TL;DR: In this article, the structural and dielectric properties of BiNbO4 as a function of cooper addition level and the radio frequency were investigated using X-ray diffraction.
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Studies of the temperature coefficient of capacitance (TCC) of a new electroceramic composite: Pb(Fe0.5Nb0.5)O3 (PFN)-Cr0.75Fe1.25O3(CRFO)
Francisco Nivaldo Aguiar Freire,Francisco Nivaldo Aguiar Freire,M Santos,F. M. M. Pereira,R. S. T. M. Sohn,J.S. Almeida,A. M. L. Medeiros,E. O. Sancho,Marcos Mota do Carmo Costa,Antonio Sergio Bezerra Sombra +9 more
TL;DR: In this article, the authors used the Rietveld procedure to study the dielectric properties in the radio frequency (RF) and microwave (MW) frequency range as a function of temperature and the temperature coefficient of capacitance.
Journal ArticleDOI
Study of the structural and dielectric properties of Bi 2 O 3 and PbO addition on BiNbO 4 ceramic matrix for RF applications
J.S. Almeida,T. S. M. Fernandes,A. J. M. Sales,Marcelo Antônio Santos Da Silva,G. F. M. P. Júnior,H. O. Rodrigues,Antonio Sergio Bezerra Sombra +6 more
TL;DR: In this paper, the structural and dielectric properties of BNO (BiNbO4) were investigated as a function of the external RF frequency and temperature, and it was shown that starting from the BNO one can increase the doping level of Bi or Pb and find a concentration where one has TCC ≥ 0.