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Ne离子束辐照引起Gd_2Ti_2O_7烧绿石体积肿胀效应研究
Swelling Effects of Pyrochlore Gd2Ti2O7 Induced by Ne Ion Irradiation
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摘要: 在液氮低温下用400 keV的Ne2＋离子束对Gd2Ti2O7多晶烧绿石进行了辐照实验研究,离子束辐照量范围为5×1014—1×1016ions/cm2。利用掠X射线衍射技术对样品辐照层的结构变化进行了分析表征,X射线的掠射角分别为γ=0.25°,0.5°,1°和3°。结果表明：在该实验条件的离子束辐照下,Gd2Ti2O7辐照层会发生明显的体积肿胀效应,体积肿胀程度随入射离子束辐照量的增大而增大;在同一辐照量下,辐照层的体积肿胀程度也随X射线入射角的增大而增大。当辐照量达到1×1016ions/cm2时,辐照层发生非晶化相变。Abstract: Polycrystalline pyrochlore Gd2Ti2O7 compounds were irradiated with 400 keV Ne2＋ ions at cryogenic temperature（~77 K）.The irradiation fluences was ranging from 5×1014 to 1×1016 ions/cm2,corresponding to a peak ballistic damage dose of ~0.16 to 3.3 displacements per atom dpa.Irradiation-induced structural evolution was examined using grazing incidence X-ray diffraction（GIXRD） at angles from 0.25° to 3° degrees.It was found that the lattice parameter increases as a function of（1） X-ray incident angle and（2） ion irradiation fluence,suggesting that the irradiated layer is volumetrically swelled compared with the underlying un-irradiated substrate.At ion fluence of 1×1016 ions/cm2,the irradiation layer was found to be amorphous.
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