Zobrazeno 1 - 10 of 96 pro vyhledávání: '"Efeito mossbauer"'
1
Magnetic behavior of the NixFe1−xNb2O6 quasi-one-dimensional system : isolation of Ising chains by frustration
Autor: Sarvezuk, Paulo Willian Carvalho, Gusmao, Miguel Angelo Cavalheiro, Cunha, Joao Batista Marimon da, Isnard, Olivier
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Physical properties of the NixFe1−xNb2O6 compounds are investigated combining x-ray and neutron powder diffraction with magnetic and calorimetry measurements as well as 57Fe Mössbauer spectroscopy. This system is known to present quasi-one-dimensi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::c844a384f548706c9b4c5ccaa1dd06b1
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2
A new approach for the determination of multiple cation locations and ordering, using the example of natural and heat-treated columbites
Autor: Kinast, Eder Julio, Isnard, Olivier, Cunha, Joao Batista Marimon da, Vasconcellos, Marcos Antonio Zen, Santos, Carlos Alberto dos
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
A new approach is proposed to determine unambiguously the location of four cations within the crystal structure of a natural AB2O6 columbite-type compound and derivatives, when submitted to order–disorder transitions caused by heat treatments. This
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::69724c4b5eb211849d4e073b86bb3196
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3
Phase separation in ion bombarded FeNi Invar alloys
Autor: Marcia Russman Gallas, J. A. H. da Jornada, L. Amaral
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Studies of the effects of ion bombardment on the phase equilibria and ordering of FeNi alloys with 30.6 and 39.5 at. % Ni were performed. The FeNi samples were bombarded with Ne, Ar, and Kr at different doses and temperatures, and analyzed using the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2d9f73490969cc330c4661e3cdfb2a73
https://doi.org/10.1063/1.350325
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4
Redução de óxidos de ferro por reação com borohidreto de sódio
Autor: Resende, Valdirene Gonzaga de
Publikováno v: Repositório Institucional da UFOP
Universidade Federal de Ouro Preto (UFOP)
instacron:UFOP
A redução química de íons de metais de transição em meio aquoso por ação do íon borohidreto foi aplicada por vários pesquisadores na síntese de ligas amorfas do tipo Fe-B. Neste projeto, fez-se o uso de partículas de óxidos de ferro susp
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::aa76b81c5e8d60a6c5d144e4ca63db67
http://www.repositorio.ufop.br/handle/123456789/2924
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5
Strain-induced shifts of the zone-center phonons of III-nitrides
Autor: Leite, J. R.
Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::021ca4852355d8c439a3babac4e1d17d
http://www.scielo.br/pdf/bjp/v34n2b/a41v342b.pdf
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6
Structural and Mössbauer characterization of the ball-milled Fe/sub x/(Al/sub 2/O/sub 3)/sub 100-x/ system
Autor: Paesano Junior, Andrea, Matsuda, Célia Kimie, Cótica, Luiz Fernando, Medeiros, Suzana Nóbrega de, Cunha, Joao Batista Marimon da, Hallouche, Bachir, Silva, Selma Luiza
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Metal-oxide composites were synthesized by high-energy ball milling of metallic iron (α-Fe) and alumina (α-Al2O3) powders, varying the starting relative concentration and the milling time. The samples were characterized by scanning electron microsc
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::f0239dec4564056636c43caf934b7347
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8
Effect of composition and short-range order on the magnetic moments of Fe in Fe/sub 1-x/V/sub x/ alloys
Autor: Krause, Joao Carlos, Schaf, Jacob, Costa Junior, Moacir Indio da, Paduani, Clederson
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
We report dc magnetization, Mössbauer spectroscopy, and x-ray-diffraction measurements on Fe₁₋xVx alloys, quenched or heat treated, with single phase bcc structure in the whole concetration range. It is well known that the saturation magnetizati
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9
Defects and magnetic hyperfine fields in ZrFe/sub 2/ investigated using perturbed-angular-correlation spectroscopy
Autor: Motta, Arthur T., Catchen, Gary L., Cumblidge, Stephen E., Rasera, R.L., Paesano Junior, Andrea, Amaral, Livio
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
We have measured the temperature dependence of the electric and magnetic hyperfine interactions at 181Ta nuclei substituted into the Zr site in the Laves-phase compound ZrFe2, using the perturbed angular correlation of g rays emitted after the b2 dec
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10
Magnetic interactions in the ludwigite Ni/sub 2/FeO/sub 2/BO/sub 3
Autor: Fernandes, Joao Carlos, Guimaraes, Renato Bastos, Continentino, Mucio Amado, Borges, Hortencio A., Sulpice, A., Tholence, Jean-Louis, Siqueira, Jesumar Lopes, Zawislak, Luci Irene, Cunha, Joao Batista Marimon da, Santos, Carlos Alberto dos
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
We present an investigation of the magnetic properties of the ludwigite Ni2FeO2BO3. This material is an oxyborate that presents in its crystalline structure subunits in the form of walls where the transition metal ions are located. Our Mossbauer, ac
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