Zobrazeno 1 - 10 of 16 pro vyhledávání: '"Nasar, Ricardo Silveira"'
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Ni Zn nanoferrite for radar-absorbing material. Journal of Magnetism and Magnetic Materials
Autor: Araujo, José Humberto de, Lima, U. R., Nasar, Marivalva Cerqueira, Nasar, Ricardo Silveira, Rezende, M. C.
Publikováno v: Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Nanoparticles of nickel–zinc ferrite have been prepared by using the citrate precursor method. According to scanning electron microscopy (SEM), the particle size is nanometric for the powder calcined at 350 °C/3.5 h. The phase formation has been s
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::08dda547f6ff9af417a7dbcd56a336f1
https://repositorio.ufrn.br/jspui/handle/123456789/29311
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3
Caracterização estrutural de Perovskitas Lax-1AxCoO3 (x=0 e 0,2) ,dopadas com cálcio e bario, por espectroscopia de absorção de raios X (XAS)
Autor: Gomes, Washington Charles de Macedo
Publikováno v: Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior In this work, the structures of LaCoO3, La0,8Ba0,2CoO3 and La0,8Ca0,2CoO3 perovskites were characterized as a function of temperature (LaCoO3 structure being analyzed only at room temper
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::10e9b1c7ff3e0ae2d795c465ef888ed3
https://repositorio.ufrn.br/jspui/handle/123456789/17779
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4
Síntese, caracterização de ferritas espinélio com propriedades magnéticas e absorvedoras de microondas
Autor: Silva, José Eves Mendes da
Publikováno v: Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Were synthesized spinel-type ferrites with general formula Ni0,8Mg0.2-xMxFe2O4, where M represents the doping Mn, Co or Mn + Co simultaneously, x ranges for the values 0.02, 0.05 and 0.1
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::54fa153a5b6945dcd672c7627bb1dbee
https://repositorio.ufrn.br/jspui/handle/123456789/17768
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5
Síntese pelo método pechini e caracterização da zircônia dopada com cério e neodímio
Autor: Andrade, Izangela Marculino de
Publikováno v: Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior In this study five compositions were synthesized zirconia doped with cerium and neodymium ions in the system Ce10-xNdx Zr90O2 with 0,5 ≤ x ≤ 4,0 using the Pechini method. The powders
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::96b15e6579c146f448519c56a747e6e3
https://repositorio.ufrn.br/jspui/handle/123456789/17754
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6
Estudo da viabilização do uso da mistura híbrida ferrocarbonila / ferrita de NI0,5Zn0,5Fe2o4 como material absorvedor de radiação eletromagnética
Autor: Rodrigues, Manuella Karla da Cruz
Publikováno v: Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Were synthesized ferrites of NiZn on systems Ni0,5Zn0,5Fe2O4, the precursors citrate method. The decomposition of the precursors was studied by thermogravimetric analysis and spectroscop
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::36c3c5e39fa421a7b5caf96e98873f40
https://repositorio.ufrn.br/jspui/handle/123456789/17652
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7
Estudo das características magnéticas e absorvedoras das ferritas de nizn, niznmn, mnzn, nimg, nicuzn e nicuznmg obtidas via método do citrato precursor
Autor: Pessoa, Régia Chacon
Publikováno v: Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Universidade Estadual de Roraima Were synthesized systems Ni0,5Zn0,5Fe2O4, i0,2Zn0,5Mn0,3Fe2O4, Mn0,5Zn0,5Fe2O4, Ni0,5Mg0,5Fe2O4, Ni0,2Cu0,3Zn0,5Fe2O4 and Ni0,2Cu0,3Zn0,5Mg0,08Fe2O4, the precursors citrate method. The decomposition of the precursors
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::31b3988faecb7c703d366f59477d9642
https://repositorio.ufrn.br/jspui/handle/123456789/17716
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8
Caracterização de cerâmicas porosas de alumina reforçada com zircônia produzidas pelo método da réplica
Autor: Souza, Fernando Barcelos Marcolino de
Publikováno v: Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Porous ceramics have many applications: thermal insulation, catalytic support, materials to fire protection, filters, and others. There are many techniques to production of ceramic filte
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::078e1b6697fc6a7bcb9e5050c4f98b51
https://repositorio.ufrn.br/jspui/handle/123456789/15562
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9
Síntese, sinterização e caracterização de ferritas à base de Ni-Zn
Autor: Moura, Alysson Elson Galvão de
Publikováno v: Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Conselho Nacional de Desenvolvimento Científico e Tecnológico Were synthesized different ferrites NixZn1-xFe2O4 (0,4 ≤ x ≤ 0,6) compositions by using citrate precursor method. Initially, the precursors citrates of iron, nickel and zinc were mix
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::3ebf232403458769da16e272a15536b7
https://repositorio.ufrn.br/jspui/handle/123456789/17599
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10
Síntese análise das propriedades magnéticas da ferrita de NiMg e características de absorção de radiação
Autor: Silva, José Eves Mendes da
Publikováno v: Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior It was synthesized different Ni1-xMgxFe2O4 (0,2 ≤ x ≤ 0,7) compositions by use of citrate precursor method. Initially, the precursory citrates of iron, nickel and magnesium were mixe
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::e4b05c14ac8f819afbf5acd44575ec80
https://repositorio.ufrn.br/jspui/handle/123456789/17600
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