Dielectric properties of composites containing melt-extracted co-based microwires

Yang Luo; Faxiang Qin; Jingshun Liu; Huan Wang; Fabrizio Scarpa; Pierre Adohi; Christian Brosseau; Hua-Xin Peng

doi:10.1016/j.coco.2016.07.004

Dielectric properties of composites containing melt-extracted co-based microwires

Yang Luo, Faxiang Qin, Jingshun Liu, Huan Wang, Fabrizio Scarpa, Pierre Adohi, Christian Brosseau, Hua-Xin Peng

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Abstract

We have investigated the microwave properties of epoxy-based composites containing melt-extracted Co_69.25Fe_4.25B_13.5−xSi₁₃Nb_x (x=0, 1, 3) microwires of various length annealed using a so-called combined current-modulation annealing (CCMA) technique. The observation of a double-peak feature in the permittivity spectra is believed due to the coexistence of the amorphous phase and a small amount of nanocrystallites on the wires with a high Nb content. CCMA was found to be favorable for a better-defined circular anisotropy of microwires and had suppressed the high-frequency peak due to residual stress relief for the composite with 25 mm long wires. Neither the shift of resonance peak nor the characteristic double peak feature was detected for composites containing as-cast 15 or 35 mm long microwires.

Original language	English
Pages (from-to)	20-24
Number of pages	5
Journal	Composites Communications
Volume	1
Early online date	7 Sept 2016
DOIs	https://doi.org/10.1016/j.coco.2016.07.004
Publication status	Published - 1 Oct 2016

Keywords

Ferromagnetic microwire-composites
Effective permittivity
Combined current-modulation annealing (CCMA)
Nb doping

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10.1016/j.coco.2016.07.004

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title = "Dielectric properties of composites containing melt-extracted co-based microwires",

abstract = "We have investigated the microwave properties of epoxy-based composites containing melt-extracted Co69.25Fe4.25B13.5−xSi13Nbx (x=0, 1, 3) microwires of various length annealed using a so-called combined current-modulation annealing (CCMA) technique. The observation of a double-peak feature in the permittivity spectra is believed due to the coexistence of the amorphous phase and a small amount of nanocrystallites on the wires with a high Nb content. CCMA was found to be favorable for a better-defined circular anisotropy of microwires and had suppressed the high-frequency peak due to residual stress relief for the composite with 25 mm long wires. Neither the shift of resonance peak nor the characteristic double peak feature was detected for composites containing as-cast 15 or 35 mm long microwires.",

keywords = "Ferromagnetic microwire-composites, Effective permittivity, Combined current-modulation annealing (CCMA), Nb doping",

author = "Yang Luo and Faxiang Qin and Jingshun Liu and Huan Wang and Fabrizio Scarpa and Pierre Adohi and Christian Brosseau and Hua-Xin Peng",

year = "2016",

month = oct,

day = "1",

doi = "10.1016/j.coco.2016.07.004",

language = "English",

volume = "1",

pages = "20--24",

journal = "Composites Communications",

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TY - JOUR

T1 - Dielectric properties of composites containing melt-extracted co-based microwires

AU - Luo, Yang

AU - Qin, Faxiang

AU - Liu, Jingshun

AU - Wang, Huan

AU - Scarpa, Fabrizio

AU - Adohi, Pierre

AU - Brosseau, Christian

AU - Peng, Hua-Xin

PY - 2016/10/1

Y1 - 2016/10/1

N2 - We have investigated the microwave properties of epoxy-based composites containing melt-extracted Co69.25Fe4.25B13.5−xSi13Nbx (x=0, 1, 3) microwires of various length annealed using a so-called combined current-modulation annealing (CCMA) technique. The observation of a double-peak feature in the permittivity spectra is believed due to the coexistence of the amorphous phase and a small amount of nanocrystallites on the wires with a high Nb content. CCMA was found to be favorable for a better-defined circular anisotropy of microwires and had suppressed the high-frequency peak due to residual stress relief for the composite with 25 mm long wires. Neither the shift of resonance peak nor the characteristic double peak feature was detected for composites containing as-cast 15 or 35 mm long microwires.

AB - We have investigated the microwave properties of epoxy-based composites containing melt-extracted Co69.25Fe4.25B13.5−xSi13Nbx (x=0, 1, 3) microwires of various length annealed using a so-called combined current-modulation annealing (CCMA) technique. The observation of a double-peak feature in the permittivity spectra is believed due to the coexistence of the amorphous phase and a small amount of nanocrystallites on the wires with a high Nb content. CCMA was found to be favorable for a better-defined circular anisotropy of microwires and had suppressed the high-frequency peak due to residual stress relief for the composite with 25 mm long wires. Neither the shift of resonance peak nor the characteristic double peak feature was detected for composites containing as-cast 15 or 35 mm long microwires.

KW - Ferromagnetic microwire-composites

KW - Effective permittivity

KW - Combined current-modulation annealing (CCMA)

KW - Nb doping

U2 - 10.1016/j.coco.2016.07.004

DO - 10.1016/j.coco.2016.07.004

M3 - Article (Academic Journal)

SN - 2452-2139

VL - 1

SP - 20

EP - 24

JO - Composites Communications

JF - Composites Communications

ER -

Dielectric properties of composites containing melt-extracted co-based microwires

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