The structural responses of A₂BO₅ (A = Nd, Gd, and Yb; B = Ti) compositions irradiated by high-energy Au ions (2.2 GeV) were investigated using transmission electron microscopy, synchrotron X-ray diffraction and Raman spectroscopy. The extent of irradiation-induced amorphization depends on the size of the A-site cation, with smaller lanthanides having less susceptibility to the accumulation of radiation damage. In the track-overlapping regime, complete amorphization is observed in all three compounds, despite the ability of Yb₂TiO₅ to incorporate a great deal of structural disorder into its initial defect-fluorite structure (Fm-3m). This is attributed to the high cation radius ratio (A:B = 2:1), which reduces the stability of the structure upon ion irradiation. The fully-amorphized samples were subsequently isochronally heated at temperature intervals from 100 °C to 850 °C. X-ray diffraction analysis indicated a similar damage recovery process in Nd₂TiO₅ and Gd₂TiO₅, where both compositions recover their original structures (Pnma) at 850 °C. In contrast, Yb₂TiO₅ exhibited recrystallization of a metastable, non-equilibrium orthorhombic phase at ~ 550 °C, prior to a transformation to the stable defect-fluorite phase (Fm-3m) at 625 °C. These compositional variations in radiation tolerance and thermal recovery processes are described in terms of the energetics of disordering during the damage and recrystallization processes.

使用透射电子显微镜，同步加速器X射线衍射和拉曼光谱研究了高能Au离子（2.2 GeV）辐照的A ₂ BO ₅（A = Nd，Gd和Yb； B = Ti）组合物的结构响应 。辐射诱导的非晶化程度取决于A位阳离子的大小，较小的镧系元素对辐射损伤的累积敏感性较低。在轨迹重叠方案中，尽管Yb ₂ TiO ₅能够将大量结构无序纳入其初始缺陷萤石结构（Fm-3m），但在所有三种化合物中均观察到了完全非晶化。）。这归因于高的阳离子半径比（A：B = 2：1），这降低了离子辐照时结构的稳定性。随后将完全非晶化的样品以100  °C至850  °C的温度间隔等时加热。X射线衍射分析表明在Nd ₂ TiO ₅和Gd ₂ TiO _5中类似的损伤恢复过程，其中两种成分在850 °C下恢复其原始结构（Pnma） 。相反，Yb ₂ TiO ₅在〜550  °C之前表现出亚稳态，不平衡的正交晶相的重结晶，然后转变为稳定的萤石缺陷相（Fm-3m）在625  °C下。辐射耐受性和热回收过程中的这些成分变化是根据损伤和再结晶过程中无序的能级来描述的。