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.

中文翻译：

---

γ辐照环氧微纳复合材料的空间电荷和电荷陷阱特性研究

用剪切混合法，用微二氧化硅和离子捕获纳米颗粒制备的环氧树脂纳米-微复合材料标本暴露于伽马辐射下，并分析了其在空间电荷和电荷陷阱特性方面的性能。环氧纳米复合材料空间电荷积累的阈值随着伽马射线辐照剂量的增加而降低，空间电荷积累的速率增加。γ辐照样品的极化过程中空间电荷密度的平均增长和极化过程中电荷衰减率的平均增长要高于原始样品。初始表面电势随伽马射线辐射剂量的增加而略有减少，但表面电势衰减率却显着增加。陷阱分布特征表明辐照后浅陷阱的数目更多，并且电荷迁移率增加。样品的相对介电常数和损耗角正切因伽马射线辐照而具有很高的影响。阿雷尼乌斯定律根据直流电导率计算出的活化能随辐射剂量的增加而降低。激光诱导击穿光谱法表明，γ辐照样品的元素组成没有变化。等离子体温度和离子线与原子线强度比随伽马射线剂量的变化与样品的维氏硬度值直接相关。阿雷尼乌斯定律根据直流电导率计算出的活化能随辐射剂量的增加而降低。激光诱导击穿光谱法表明，γ辐照样品的元素组成没有变化。等离子体温度和离子线与原子线强度比随伽马射线剂量的变化与样品的维氏硬度值直接相关。阿雷尼乌斯定律根据直流电导率计算出的活化能随辐射剂量的增加而降低。激光诱导击穿光谱法表明，γ辐照样品的元素组成没有变化。等离子体温度和离子线与原子线强度比随伽马射线剂量的变化与样品的维氏硬度值直接相关。