Study of temperature effects on the conduction and trapping of charges in the alkali-silicate glass under electron beam irradiation

Fakhfakh, S.; Elsafi, B.; Fakhfakh, Z.; Jbara, O.

doi:10.1016/j.apsusc.2011.10.007

Cited by 8 publications

(6 citation statements)

References 22 publications

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“…The bulk discharge brings main part of trapped electrons to leave material surface in very short time leading to a fast decrease in the detrapping rate. In most studied materials [ 26 , 27 , 28 , 29 ], the detrapping rate decreases exponentially owing the influence current to take the same trends. Consequently, the influence current preserves moderate constant values for both temperatures, which means that detrapping process under high temperatures (below the melting peak) is constant.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the electron beam can be positioned to the chosen position with great precision (local irradiation) and several penetration depths of electrons in the irradiated sample can be achieved by changing their primary energy. The second point is that during a few decades of time, the developed theoretical aspect has been validated in a consistent experimental test with the buildup arrangement in a SEM on a large variety of materials ranging from glasses [ 22 , 27 ] passing through polymers [ 20 , 23 , 25 ] and ending with nano-composites [ 21 , 26 ].…”

Section: Fundamental Aspectsmentioning

confidence: 91%

“…K is a calculable or measurable quantity [ 25 ] and is dependent on the sample geometry (thickness), sample properties (relative permittivity) and the electrical characteristics of the environment surrounding the sample. It was also found that this factor depends strongly on the applied temperature [ 27 , 28 , 29 ].…”

Section: Fundamental Aspectsmentioning

confidence: 99%

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Effect of Isothermal Conditions on the Charge Trapping/Detrapping Parameters in e-Beam Irradiated Thermally Aged XLPE Insulation in SEM

et al. 2022

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The effect of isothermal conditions on the trapping/detrapping process of charges in e-beam irradiated thermally aged XLPE insulation in scanning electron microscopy (SEM) has been investigated. Different isothermal conditions ranging from room temperature to 120 °C are applied on both unaged and aged XLPE samples (2 mm thick) by a suitable arrangement associated with SEM. For each applied test temperature, leakage, and influence currents have been measured simultaneously during and after e-beam irradiation. Experimental results show a big difference between the fresh and aged material regarding trapping and detrapping behavior. It has been pointed out that in the unaged material deep traps govern the process, whereas the shallow traps take part in the aged one. Almost all obtained results reveal that the trapped charge decreases and then increases as the temperature increases for the unaged sample. A deflection temperature corresponding to a minimum is observed at 50 °C. However, for the aged material, the maximum trapped charge decreases continuously with increasing temperature, and the material seems to trap fewer charges under e-beam irradiation at high temperature. Furthermore, thermal aging leads to the occurrence of detrapping process at high temperatures even under e-beam irradiation, which explains the decrease with time evolution of trapped charge during this period. The recorded leakage current increases with increasing temperature for both cases with pronounced values for aged material. The effect of temperature and thermal aging on electrostatic influence factor (K) and total secondary electron emission yield (σ) were also studied.

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Section: Resultsmentioning

confidence: 99%

Section: Fundamental Aspectsmentioning

confidence: 91%

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Effect of Isothermal Conditions on the Charge Trapping/Detrapping Parameters in e-Beam Irradiated Thermally Aged XLPE Insulation in SEM

et al. 2022

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“…The speed of the variant can be characterized by the parameter of time constant. Some reports [17][18][19] think that the relationship between the surface potential and irradiation time can be fitted using an exponential function…”

Section: Properties Of Dynamic Seymentioning

confidence: 99%

Dynamic secondary electron emission characteristics of polymers in negative charging process

Weng

Zhang

et al. 2016

Mod. Phys. Lett. B

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We studied the dynamic secondary electron emission (SEE) characteristics of a polyimide sample in negative charging process under electron bombardment. The time evolution of secondary electron yield (SEY) has been measured with a pulsed electron gun. The dynamic SEY, as well as the surface potential have been analyzed using a capacitance model. The shift in surface potential caused by the negative charge accumulation on the sample reduces the landing energy of the primary electrons (PEs), which in turn alters the SEY. The charging process tends to be stable when the landing energy of PEs reaches the secondary crossover energy where the corresponding SEY is 1. The surface potential has an approximately negative exponential relationship with the irradiation time. The total accumulated charge at the stable state is found to be proportional to the product of the sample capacitance and the difference between initial incident energy and the secondary crossover energy. The time constant of the exponential function is proportional to the ratio of final accumulated charge to the incident current.

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“…A laboratory-built device suited to the SEM has been used. This allows access to the displacement current produced by the buildup charge as well as to the sample current due to the flow of electric charges to the ground [31,32]. The method is contactless since charges are injected into the polymer without electrodes and under a high vacuum.…”

Section: Introductionmentioning

confidence: 99%

Temperature effects on electric charge transport processes and electron emission in PBS–clay nanocomposites submitted to electron bombardment

Taktak

Fakhfakh

Rondot

et al. 2023

J. Phys. D: Appl. Phys.

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Isothermal conditions effects on the charge transport processes and electron emission properties in polybutylene succinate (PBS) nanoclay composites are investigated. The temperature range used (20°C to 80°C) is close to the conditions of use of materials in many applications (insulation, sensors). These effects are highlighted using an appropriate device, placed in a scanning electron microscope (SEM), allowing measurement of induced currents in an electron irradiated specimen. The experimental results showed that the rise in temperature involves a decrease in the charging ability and an increase in conductivity of PBS nanocomposites. The mobility of charge carriers and its thermal dependency deduced during the discharge step were found to be lower for the nanocomposites. A qualitative analysis, expressed for understanding these observations, is based on the determination of electron trap energy distribution (i.e. density of occupied states). Secondary electron emission yield decreased with increasing temperature. The results help us envision a new class of insulators with improved electrical performances. The operating thermal stress, combined with the absence of trapped charges, allows to reduce the electrical and thermal aging and to ensure consequently the long-term reliability of the insulators (for instance under HV).

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Study of temperature effects on the conduction and trapping of charges in the alkali-silicate glass under electron beam irradiation

Cited by 8 publications

References 22 publications

Effect of Isothermal Conditions on the Charge Trapping/Detrapping Parameters in e-Beam Irradiated Thermally Aged XLPE Insulation in SEM

Effect of Isothermal Conditions on the Charge Trapping/Detrapping Parameters in e-Beam Irradiated Thermally Aged XLPE Insulation in SEM

Dynamic secondary electron emission characteristics of polymers in negative charging process

Temperature effects on electric charge transport processes and electron emission in PBS–clay nanocomposites submitted to electron bombardment

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