| 1. Identificação | |
| Tipo de Referência | Artigo em Revista Científica (Journal Article) |
| Site | plutao.sid.inpe.br |
| Código do Detentor | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S |
| Identificador | J8LNKB5R7W/3Q635UM |
| Repositório | urlib.net/www/2017/12.05.13.19.58 (acesso restrito) |
| Última Atualização | 2017:12.08.15.50.42 (UTC) administrator |
| Repositório de Metadados | urlib.net/www/2017/12.05.13.19.59 |
| Última Atualização dos Metadados | 2018:06.04.23.26.39 (UTC) administrator |
| DOI | 10.1016/j.ceramint.2017.10.023 |
| ISSN | 0272-8842 |
| Rótulo | lattes: 5076862030728693 4 CarvalhoLemMigMacPul:2017:StCoEl |
| Chave de Citação | CarvalhoLemMigMacPul:2017:StCoEl |
| Título | Structural and complex electromagnetic properties of cobalt ferrite (CoFe 2 O 4 ) with an addition of niobium pentoxide  |
| Ano | 2017 |
| Data de Acesso | 19 abr. 2024 |
| Tipo de Trabalho | journal article |
| Tipo Secundário | PRE PI |
| Número de Arquivos | 1 |
| Tamanho | 1736 KiB |
| 2. Contextualização | |
| Autor | 1 Carvalho, F. E. 2 Lemos, L. V. 3 Migliano, A. C. C. 4 Machado, João Paulo Barros 5 Pullar, R. C. |
| Identificador de Curriculo | 1 2 3 4 8JMKD3MGP5W/3C9JHER |
| Grupo | 1 2 3 4 LABAS-COCTE-INPE-MCTIC-GOV-BR |
| Afiliação | 1 Instituto Tecnológico de Aeronáutica (ITA) 2 Instituto Tecnológico de Aeronáutica (ITA) 3 Instituto Tecnológico de Aeronáutica (ITA) 4 Instituto Nacional de Pesquisas Espaciais (INPE) 5 Universidade de Aveiro |
| Endereço de e-Mail do Autor | 1 2 3 4 joao.machado@inpe.br |
| Revista | Ceramics International |
| Volume | 44 |
| Número | 1 |
| Páginas | 915-921 |
| Nota Secundária | A1_INTERDISCIPLINAR A1_ENGENHARIAS_III A1_ENGENHARIAS_II A1_ENGENHARIAS_I A2_MATERIAIS A2_ENGENHARIAS_IV A2_CIÊNCIAS_AGRÁRIAS_I B1_GEOCIÊNCIAS B1_ARQUITETURA_E_URBANISMO B2_QUÍMICA B2_ODONTOLOGIA B2_ENSINO B2_BIOTECNOLOGIA B3_ASTRONOMIA_/_FÍSICA B5_CIÊNCIAS_AMBIENTAIS |
| Histórico (UTC) | 2017-12-08 15:50:42 :: lattes -> administrator :: 2017 2018-06-04 23:26:39 :: administrator -> simone :: 2017 |
| 3. Conteúdo e estrutura | |
| É a matriz ou uma cópia? | é a matriz |
| Estágio do Conteúdo | concluido |
| Transferível | 1 |
| Tipo do Conteúdo | External Contribution |
| Tipo de Versão | publisher |
| Palavras-Chave | Cobalt ferrite Niobium oxide Complex permeability Complex permittivity FeNbO4 Radome materials |
| Resumo | Niobium pentoxide (Nb2O5) was added to cobalt spinel ferrite (CoFe2O4) powders for the first time, at varying amounts of 0, 5, 10 and 15 wt%. The purpose was to evaluate the effect of niobia on the crystalline phases, microstructure and complex electromagnetic behaviour (complex permittivity and permeability between 300 MHz and 10 GHz) of CoFe2O4. The samples were prepared by conventional ceramic methods and sintered at 1475 °C, as potential applications are as aerospace materials (radomes) which have to survive at such temperatures upon re-entry. The only crystalline phase observed in all samples was CoFe2O4, but microstructural evaluation showed that a non-crystalline, niobium-rich intergranular region was formed between the grains with niobium addition, and this apparent liquid/glassy phase aided sintering as considerable grain growth was also observed. It was shown by Raman spectroscopy that this niobium-rich amorphous intergranular phase was FeNbO4. The electromagnetic measurements of complex permittivity (ε*) and permeability (μ*) measurements indicated a steady decrease in both permittivity and permeability with increasing niobium oxide addition, although the values for each sample were relatively stable between 300 MHz and 10 GHz. The real permittivity, ε′, decreased from ~ 12 in the pure CoFe2O4 to ~ 5.5 with increasing addition, while its imaginary part assumed values very close to zero. At the same time, the real permeability, μ′, decreased from ~ 1.4 to ~ 1.1, and a similar effect can be observed in the permeability curves. The results of the complex measurements also allowed us to obtain reflectivity graphs representing the energy loss of the incident electromagnetic wave when crossing the layer of the evaluated composition. The graphs are presented in the frequency domain, and indicate that the reflection loss increases with the addition of niobia. |
| Área | FISMAT |
| Arranjo | urlib.net > BDMCI > Fonds > Produção anterior à 2021 > LABAS > Structural and complex... |
| Conteúdo da Pasta doc | acessar |
| Conteúdo da Pasta source | não têm arquivos |
| Conteúdo da Pasta agreement | não têm arquivos |
| 4. Condições de acesso e uso | |
| Idioma | en |
| Arquivo Alvo | carvalho_structural.pdf |
| Grupo de Usuários | lattes |
| Grupo de Leitores | administrator lattes |
| Visibilidade | shown |
| Permissão de Leitura | deny from all and allow from 150.163 |
| Permissão de Atualização | não transferida |
| 5. Fontes relacionadas | |
| Unidades Imediatamente Superiores | 8JMKD3MGPCW/3ESR3H2 |
| Divulgação | WEBSCI; PORTALCAPES; COMPENDEX. |
| Acervo Hospedeiro | dpi.inpe.br/plutao@80/2008/08.19.15.01 |
| 6. Notas | |
| Campos Vazios | alternatejournal archivingpolicy archivist callnumber copyholder copyright creatorhistory descriptionlevel e-mailaddress format isbn lineage mark mirrorrepository month nextedition notes orcid parameterlist parentrepositories previousedition previouslowerunit progress project rightsholder schedulinginformation secondarydate secondarykey session shorttitle sponsor subject tertiarymark tertiarytype url |
| 7. Controle da descrição | |
| e-Mail (login) | simone |
| atualizar | |