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1. Identificação
Tipo de ReferênciaArtigo em Revista Científica (Journal Article)
Sitemtc-m21c.sid.inpe.br
Código do Detentorisadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S
Identificador8JMKD3MGP3W34R/424788B
Repositóriosid.inpe.br/mtc-m21c/2020/03.03.13.27   (acesso restrito)
Última Atualização2020:03.03.13.27.50 (UTC) simone
Repositório de Metadadossid.inpe.br/mtc-m21c/2020/03.03.13.27.50
Última Atualização dos Metadados2022:01.04.01.34.59 (UTC) administrator
DOI10.1016/j.jallcom.2019.153470
ISSN0925-8388
Chave de CitaçãoDhruvMPCJBPMRB:2020:InStMa
TítuloInvestigation of structural, magnetic and dielectric properties of gallium substituted Z-type Sr3Co2-xGaxFe24O41 hexaferrites for microwave absorbers
Ano2020
Mêsmay
Data de Acesso09 maio 2024
Tipo de Trabalhojournal article
Tipo SecundárioPRE PI
Número de Arquivos1
Tamanho6726 KiB
2. Contextualização
Autor 1 Dhruv, Preksha N.
 2 Meena, Sher Singh
 3 Pullar, Robert C.
 4 Carvalho, Francisco E.
 5 Jotania, Rajshree B.
 6 Bhatt, Pramod
 7 Prajapat, C. L.
 8 Machado, João Paulo Barros
 9 Rao, T. V. Chandrasekhar
10 Basak, C. B.
Identificador de Curriculo 1
 2
 3
 4
 5
 6
 7
 8 8JMKD3MGP5W/3C9JHER
Grupo 1
 2
 3
 4
 5
 6
 7
 8 LABAS-COCTE-INPE-MCTIC-GOV-BR
Afiliação 1 Gujarat University
 2 Bhabha Atomic Research Centre
 3 University of Aveiro
 4 Instituto Tecnológico de Aeronáutica (ITA)
 5 Gujarat University
 6 Bhabha Atomic Research Centre
 7 Bhabha Atomic Research Centre
 8 Instituto Nacional de Pesquisas Espaciais (INPE)
 9 Bhabha Atomic Research Centre
10 Homi Bhabha National Institute
Endereço de e-Mail do Autor 1
 2 ssingh@barc.gov.in
 3
 4
 5 rbjotania@gmail.com
 6
 7
 8 joao.machado@inpe.br
RevistaJournal of Alloys and Compounds
Volume822
Páginase153470
Nota SecundáriaA1_MATERIAIS A1_INTERDISCIPLINAR A1_ENGENHARIAS_II A2_ODONTOLOGIA A2_GEOCIÊNCIAS A2_ENGENHARIAS_III A2_ENGENHARIAS_I B1_QUÍMICA B1_ENGENHARIAS_IV B1_BIOTECNOLOGIA B1_ASTRONOMIA_/_FÍSICA B2_ANTROPOLOGIA_/_ARQUEOLOGIA
Histórico (UTC)2020-03-03 13:29:30 :: simone -> administrator :: 2020
2020-03-04 08:26:28 :: administrator -> simone :: 2020
2020-06-19 14:11:02 :: simone -> administrator :: 2020
2022-01-04 01:34:59 :: administrator -> simone :: 2020
3. Conteúdo e estrutura
É a matriz ou uma cópia?é a matriz
Estágio do Conteúdoconcluido
Transferível1
Tipo do ConteúdoExternal Contribution
Tipo de Versãopublisher
Palavras-ChaveGallium substituted Z-type hexaferrites
Sol-gel auto-combustion
Structural properties
Magnetic properties
Microwave absorption performance
ResumoGallium substituted Z-type hexagonal ferrites with chemical composition Sr3Co2-xGaxFe24O41 (x ¼ 0.0,0.4, 0.8, 1.2, 1.6, and 2.0) were successfully synthesised in air at 1200 C for 5 h using the sol-gel autocombustion technique, in order to investigate the effect of gallium substitution on structural, magnetic and dielectric properties. X-ray Diffraction (XRD) analysis of all samples reveals the formation of mixed hexaferrite phases, with Z ferrite as the major phase (72e90%).The average crystallite size of heated powders was found to be in the range of 21e40 nm. The saturation magnetisation decreases after gallium substitution, with the lowest values of 64 Am2 kg1 for composition x ¼ 1.6, which also hasthe highest value of coercivity (28.3 kA m1 ). Nevertheless, all were soft ferrites, with Hc between 3.4 and 28.3 kA m1 .The Mr/MS ratio of all samples was found to be less than 0.5, suggesting that all the compositions possess multi-domain microstructures. Mossbauer spectroscopic analysis con firmed that the Fe ions were found in the 3 þ high spin state for compositions below x 0.4, whereas ~1.5% of the Fe ions were converted into Fe2þ high spin state beyond x 0.8 compositions, as Ga3þ began to substitute for Fe3þ, forming Fe2þ in the cobalt positions. The average hyperfine magnetic field (<Hhf>) was found to be decreased with Ga-substitution. Dielectric parameters such as dielectric constant and loss factor were studied as a function of frequency, and their results show normal behaviour for ferrimagnetic materials. In complex measurements at microwave frequencies (8 GHze12.5 GHz, the X-band), all samples had a real permittivity of around 8e14. For sample x ¼ 2.0, a dielectric resonance peak was observed around 12.15 GHz. All showed a real permeability of around 1.0e1.4 over the frequency of 8 GHze12.5 GHz range, and ferromagnetic resonance (FMR) was observed in x ¼ 0.0 and 2.0 samples, at around 11 and 12 GHz, respectively. This suggests that the prepared samples can be used as microwave absorbers/EMI shielding at specific microwave frequencies. The co-existence of FMR and dielectric resonance at the same frequency of 12.15 GHz for x ¼ 2.0 could lead to the coupling of these resonances and the development of potential metamaterials.
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5. Fontes relacionadas
Unidades Imediatamente Superiores8JMKD3MGPCW/3ESR3H2
Lista de Itens Citandosid.inpe.br/bibdigital/2013/09.24.19.30 2
DivulgaçãoWEBSCI; PORTALCAPES.
Acervo Hospedeirourlib.net/www/2017/11.22.19.04
6. Notas
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