Investigation on space charge and charge trap characteristics of gamma-irradiated epoxy micro–nano composites

Autor: Myneni Sukesh Babu, Ramanujam Sarathi, Nilesh Jayantilal Vasa, Takahiro Imai
Jazyk: angličtina
Rok vydání: 2019
Předmět:
filled polymers
nanocomposites
silicon compounds
dielectric losses
gamma-ray effects
mixing
resins
nanoparticles
permittivity
space charge
surface potential
vickers hardness
nanomechanics
carrier mobility
electron traps
electrical conductivity
spectrochemical analysis
charge trap characteristics
ion trapping nanoparticle
space charge accumulation
space charge density
poling
charge decay rate
gamma-irradiated specimen
surface potential decay rate
trap distribution characteristics
charge mobility
gamma-irradiated epoxy nanocomposites
gamma-irradiated epoxy microcomposites
microsilica
shear mixing process
relative permittivity
loss tangent
activation energy
dc conductivity
arrhenius law
radiation dose
laser-induced breakdown spectroscopy
elemental composition
plasma temperature
ion line-atomic line intensity ratio
vickers hardness number
sio(2)
Electrical engineering. Electronics. Nuclear engineering
TK1-9971
Electricity
QC501-721
Zdroj: High Voltage (2019)
Druh dokumentu: article
ISSN: 2397-7264
DOI: 10.1049/hve.2019.0188
Popis: Epoxy nano–micro composite specimen prepared with micro silica and ion trapping nanoparticle, by shear mixing process, was exposed to gamma radiation and its performance for space charge and charge trap characteristics were analysed. The threshold for space charge accumulation of epoxy nanocomposites reduces and rate of space charge accumulation increases with an increase in dosage of gamma irradiation. The average growth of space charge density during poling and charge decay rate during depoling are relatively higher for gamma-irradiated specimens than the virgin specimen. The initial surface potential has a marginal reduction with increase in the dosage of gamma radiation, but the surface potential decay rate has increased significantly. Trap distribution characteristics indicate more number of shallow traps and increase in charge mobility after irradiation. The relative permittivity and loss tangent of the specimens have high impact due to gamma irradiation. The activation energy calculated from DC conductivity by Arrhenius law reduces with increment in radiation dose. Laser-induced breakdown spectroscopy reflected no change in elemental composition with gamma-irradiated specimen. The variation in plasma temperature and ion line to atomic line intensity ratio with dosage of gamma radiation have direct correlation to the Vickers hardness number of the specimens.
Databáze: Directory of Open Access Journals
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