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Polyethylene terephthalate (PET) has been used in a wide range of applications as insulating material in electrical equipment which possibly operate in radioactive environment such as nuclear power plant, spacecraft and scientific facilities. The PET used in such an environment is exposed to a great risk of high radiation induced ageing that gives rise to the deterioration of its insulation property...
The effect of gamma-ray irradiation on relative permittivity, ac conductivity and dielectric loss tangent of epoxy resin and polyethylene has been investigated. Laminated samples were irradiated by 60Co gamma source at room temperature in air with a dose rate of 10 kGy/h and the total dose were 100 kGy and 1000 kGy. The dielectric properties were measured by using a Precision LCR Meter (Agilent E4980A)...
Two distinct regions of the dc conductivity and its temperature dependence as a function of the mol fraction of alkali oxides, X, are observed in Na- and Li-borate glasses. At low alkali contents the dc conductivity σ dc increases only moderately with X. However, at higher alkali contents, log σ dc increases linearly and the activation enthalpy ΔH of σ dc ×T decreases linearly...
We have formed GeMoW and Ge(As)MoW ohmic contacts to n-type GaAs using different types of annealing techniques, under either a forming gas or an As overpressure. A comprehensive study of both contacts is presented using electrical testing, Auger electron spectroscopy, secondary ion-mass spectrometry, transmission electron microscopy and scanning transmission electron microscopy. Very low specific...
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