关键词: 
Gd₂Ti₂O₇ /
离子束辐照 /
掠X射线衍射技术 /
体积肿胀效应

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。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 . 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.