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330 results on '"Fechine, P.B.A."'

39. Raman scattering and x-ray diffraction studies of polycrystalline CaCu3Ti4 O12 under high-pressure

Author

Valim, D., Souza Filho, A.G., Freire, P.T.C., Fagan, S.B., Ayala, A.P., Mendes Filho, J., Almeida, A.F.L., Fechine, P.B.A., Sombra, A.S.B., Olsen, Janus Staun, Gerward, L., Valim, D., Souza Filho, A.G., Freire, P.T.C., Fagan, S.B., Ayala, A.P., Mendes Filho, J., Almeida, A.F.L., Fechine, P.B.A., Sombra, A.S.B., Olsen, Janus Staun, and Gerward, L.

Abstract

Udgivelsesdato: 20 Oct.

Published
2004

48. Microstructure and magneto-dielectric properties of ferrimagnetic composite GdIG X :YIG1− X at radio and microwave frequencies

Author

Fechine, P.B.A., Pereira, F.M.M., Santos, M.R.P., Filho, F.P., de Menezes, A.S., de Oliveira, R.S., Góes, J.C., Cardoso, L.P., and Sombra, A.S.B.

Subjects
*MICROSTRUCTURE, *DIELECTRICS, *MICROWAVES, *COMPOSITE materials, *GARNET, *MAGNETIC permeability, *FERRIMAGNETISM, *RIETVELD refinement, *X-ray diffraction
Abstract

Abstract: The gadolinium iron garnet (GdIG, Gd3Fe5O12) and yttrium iron garnet (YIG, Y3Fe5O12), and their GdIG X :YIG1− X composites, were obtained by a new solid-state procedure. The microstructure of the samples was studied by X-ray powder diffraction and Rietveld refinement, Vickers microhardness and scanning electron microscopy. The density and microhardness behavior were studied as a function of the lattice parameters for the composite samples. In the present work, the magnetic and dielectric properties of the GdIG X :YIG1− X composite at radio and microwave frequencies were also studied. The magnetic permeability and dielectric permittivity and loss properties for the composite GdIG X :YIG1− X showed good potential for use in components, when one is looking for moderate ε r′ and μ r′ materials with low loss in the radio-frequency and microwave range. [Copyright &y& Elsevier]

Published
2009
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49. Synthesis, structure and vibrational properties of GdIG X :YIG1− X ferrimagnetic ceramic composite

Author

Fechine, P.B.A., Silva, E.N., de Menezes, A.S., Derov, J., Stewart, J.W., Drehman, A.J., Vasconcelos, I.F., Ayala, A.P., Cardoso, L.P., and Sombra, A.S.B.

Subjects
*YTTRIUM iron garnet, *FERRIMAGNETISM, *HYSTERESIS loop, *MAGNETIZATION, *X-ray diffraction, *MOSSBAUER spectroscopy
Abstract

Abstract: Y3Fe5O12 (YIG) crystal has many attractive characteristics, such as low dielectric loss, narrow resonance linewidth in microwave region and also possesses a good saturated magnetization value. Composite technology in general sets out to combine materials in such a way that the properties of the composite are the optimum for a particular application. The different materials work together to give a composite of unique properties. In this work, we present the preparation procedure (obtaining) of the GdIG X :YIG1− X ferrimagnetic ceramic matrix composite by mechanical alloying and calcinations. Besides that, we study its properties by X-ray powder diffraction, infrared, Micro-Raman, 57Fe Mössbauer spectroscopy and hysteresis loop measurements. [Copyright &y& Elsevier]

Published
2009
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