Tunable dielectric and microwave properties of epoxy composites with cofe₂o₄ and mgfe₂o₄ spinel ferrites

Eduardo V. Araújo; Raphael V.B. Campos; Marcelo A.S. Silva; Antônio S.B. Sombra; Luciana M.R. Alencar; Alan S. de Menezes; Ralph Santos-Oliveira; Danielo G. Gomes; Juliano C. Denardin; Rafael M. Freire; Pierre B.A. Fechine

doi:10.1007/s00339-025-08857-5

Tunable dielectric and microwave properties of epoxy composites with cofe₂o₄ and mgfe₂o₄ spinel ferrites

Eduardo V. Araújo
, Raphael V.B. Campos
, Marcelo A.S. Silva
, Antônio S.B. Sombra
, Luciana M.R. Alencar
, Alan S. de Menezes
, Ralph Santos-Oliveira
, Danielo G. Gomes
, Juliano C. Denardin
, Rafael M. Freire
, Pierre B.A. Fechine

Research output: Contribution to journal › Article › peer-review

Abstract

In this study, we developed polymer-ceramic composites based on diglycidyl ether bisphenol A (DGEBA) epoxy resin reinforced with spinel ferrites, CoFe₂O₄ (CFO) and MgFe₂O₄ (MFO), aiming for advanced dielectric applications. The curing process was optimized using branched polyethyleneimine (BPEI) as a hardener, achieving an optimal 4:1 DGEBA: BPEI ratio at 100 °C for 1 h. Structural and morphological characterizations were performed using XRD, vibrating sample magnetometry (VSM), FTIR and SEM. Dielectric properties were investigated through impedance spectroscopy in the radiofrequency range (1–10 MHz) at temperatures from 100 to 200 °C, while microwave properties were analyzed in the X-band (8.2–12.4 GHz). All analyzed samples exhibited behavior that could be described by two R-CPE circuits. The composites were also evaluated in the microwave region, specifically in the X-band, where two absorption peaks were observed at around 11 and 11.9 GHz for the MFO10, MFO20, and CFO10 samples.

Original language	English
Article number	708
Journal	Applied Physics A: Materials Science and Processing
Volume	131
Issue number	9
DOIs	https://doi.org/10.1007/s00339-025-08857-5
State	Published - Sep 2025

Keywords

DGEBA
Microwave applications
Polymer-ceramic composite
Spinel ferrite

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Araújo, E. V., Campos, R. V. B., Silva, M. A. S., Sombra, A. S. B., Alencar, L. M. R., de Menezes, A. S., Santos-Oliveira, R., Gomes, D. G., Denardin, J. C., Freire, R. M., & Fechine, P. B. A. (2025). Tunable dielectric and microwave properties of epoxy composites with cofe₂o₄ and mgfe₂o₄ spinel ferrites. Applied Physics A: Materials Science and Processing, 131(9), Article 708. https://doi.org/10.1007/s00339-025-08857-5

@article{f620801f829a4c4ba9153c9a2b15c4c9,

title = "Tunable dielectric and microwave properties of epoxy composites with cofe₂o₄ and mgfe₂o₄ spinel ferrites",

abstract = "In this study, we developed polymer-ceramic composites based on diglycidyl ether bisphenol A (DGEBA) epoxy resin reinforced with spinel ferrites, CoFe₂O₄ (CFO) and MgFe₂O₄ (MFO), aiming for advanced dielectric applications. The curing process was optimized using branched polyethyleneimine (BPEI) as a hardener, achieving an optimal 4:1 DGEBA: BPEI ratio at 100 °C for 1 h. Structural and morphological characterizations were performed using XRD, vibrating sample magnetometry (VSM), FTIR and SEM. Dielectric properties were investigated through impedance spectroscopy in the radiofrequency range (1–10 MHz) at temperatures from 100 to 200 °C, while microwave properties were analyzed in the X-band (8.2–12.4 GHz). All analyzed samples exhibited behavior that could be described by two R-CPE circuits. The composites were also evaluated in the microwave region, specifically in the X-band, where two absorption peaks were observed at around 11 and 11.9 GHz for the MFO10, MFO20, and CFO10 samples.",

keywords = "DGEBA, Microwave applications, Polymer-ceramic composite, Spinel ferrite",

author = "Ara{\'u}jo, \{Eduardo V.\} and Campos, \{Raphael V.B.\} and Silva, \{Marcelo A.S.\} and Sombra, \{Ant{\^o}nio S.B.\} and Alencar, \{Luciana M.R.\} and \{de Menezes\}, \{Alan S.\} and Ralph Santos-Oliveira and Gomes, \{Danielo G.\} and Denardin, \{Juliano C.\} and Freire, \{Rafael M.\} and Fechine, \{Pierre B.A.\}",

note = "Publisher Copyright: {\textcopyright} The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.",

year = "2025",

month = sep,

doi = "10.1007/s00339-025-08857-5",

language = "English",

volume = "131",

journal = "Applied Physics A: Materials Science and Processing",

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Araújo, EV, Campos, RVB, Silva, MAS, Sombra, ASB, Alencar, LMR, de Menezes, AS, Santos-Oliveira, R, Gomes, DG, Denardin, JC, Freire, RM & Fechine, PBA 2025, 'Tunable dielectric and microwave properties of epoxy composites with cofe₂o₄ and mgfe₂o₄ spinel ferrites', Applied Physics A: Materials Science and Processing, vol. 131, no. 9, 708. https://doi.org/10.1007/s00339-025-08857-5

TY - JOUR

T1 - Tunable dielectric and microwave properties of epoxy composites with cofe₂o₄ and mgfe₂o₄ spinel ferrites

AU - Araújo, Eduardo V.

AU - Campos, Raphael V.B.

AU - Silva, Marcelo A.S.

AU - Sombra, Antônio S.B.

AU - Alencar, Luciana M.R.

AU - de Menezes, Alan S.

AU - Santos-Oliveira, Ralph

AU - Gomes, Danielo G.

AU - Denardin, Juliano C.

AU - Freire, Rafael M.

AU - Fechine, Pierre B.A.

N1 - Publisher Copyright: © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

PY - 2025/9

Y1 - 2025/9

N2 - In this study, we developed polymer-ceramic composites based on diglycidyl ether bisphenol A (DGEBA) epoxy resin reinforced with spinel ferrites, CoFe₂O₄ (CFO) and MgFe₂O₄ (MFO), aiming for advanced dielectric applications. The curing process was optimized using branched polyethyleneimine (BPEI) as a hardener, achieving an optimal 4:1 DGEBA: BPEI ratio at 100 °C for 1 h. Structural and morphological characterizations were performed using XRD, vibrating sample magnetometry (VSM), FTIR and SEM. Dielectric properties were investigated through impedance spectroscopy in the radiofrequency range (1–10 MHz) at temperatures from 100 to 200 °C, while microwave properties were analyzed in the X-band (8.2–12.4 GHz). All analyzed samples exhibited behavior that could be described by two R-CPE circuits. The composites were also evaluated in the microwave region, specifically in the X-band, where two absorption peaks were observed at around 11 and 11.9 GHz for the MFO10, MFO20, and CFO10 samples.

AB - In this study, we developed polymer-ceramic composites based on diglycidyl ether bisphenol A (DGEBA) epoxy resin reinforced with spinel ferrites, CoFe₂O₄ (CFO) and MgFe₂O₄ (MFO), aiming for advanced dielectric applications. The curing process was optimized using branched polyethyleneimine (BPEI) as a hardener, achieving an optimal 4:1 DGEBA: BPEI ratio at 100 °C for 1 h. Structural and morphological characterizations were performed using XRD, vibrating sample magnetometry (VSM), FTIR and SEM. Dielectric properties were investigated through impedance spectroscopy in the radiofrequency range (1–10 MHz) at temperatures from 100 to 200 °C, while microwave properties were analyzed in the X-band (8.2–12.4 GHz). All analyzed samples exhibited behavior that could be described by two R-CPE circuits. The composites were also evaluated in the microwave region, specifically in the X-band, where two absorption peaks were observed at around 11 and 11.9 GHz for the MFO10, MFO20, and CFO10 samples.

KW - DGEBA

KW - Microwave applications

KW - Polymer-ceramic composite

KW - Spinel ferrite

UR - https://www.scopus.com/pages/publications/105013648098

U2 - 10.1007/s00339-025-08857-5

DO - 10.1007/s00339-025-08857-5

M3 - Article

AN - SCOPUS:105013648098

SN - 0947-8396

VL - 131

JO - Applied Physics A: Materials Science and Processing

JF - Applied Physics A: Materials Science and Processing

IS - 9

M1 - 708

ER -

Tunable dielectric and microwave properties of epoxy composites with cofe₂o₄ and mgfe₂o₄ spinel ferrites

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Keywords

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