TEM, electron diffraction, energy dispersive X-ray spectrometry and electron energy loss spectroscopy characterization of a multilayer composite Ag/YBa2Cu3O6+δ/LaMnO3/MgO/Y2O3/Al2O3/Hastelloy after exposure to Xe and Kr ions with energies from E ≅ 0.04 to E ≅ 0.8 MeV/nucleon was carried out. Changes in the chemical composition, morphology and sizes of linear radiation defects, tracks, in the YBa2Cu3O6+δ and secondary phase precipitates were investigated. It was found that all radiation defects had amorphous structure regardless the ion energy, while the change in chemical composition was dependent on atomic radius (or mass) of stopping ion and atoms in samples. The diameters of linear defects remain constant for each material in the ion energy range used and distance passed by ions in the samples, about 1 μm, and correlate with the material parameters. The largest track diameters of 10–12 nm were registered in the YCuO2 phase, which has the lowest density, low melting point and the lowest threshold of electronic stopping power of track formation among all the studied compounds. The experimentally measured track diameters in YBCO and secondary phase precipitates were compared with the predictions of the analytical thermal spike model. It is shown that for dielectrics such as simple yttrium oxide and yttrium-copper oxide, with the stopping power of ions exceeding 10 keV/nm, the measured diameters agree with the calculated values within the experimental error or the deviation does not exceed 10%. The discrepancy between the sizes of the observed and calculated tracks at lower stopping powers, as well as the contradiction in the qualitative behavior of the track radius depending on the energy losses, may be due to the inaccuracy of the thermal spike model associated with the underlying significant assumptions.

中文翻译：

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分析能量为 0.04–0.8 MeV/核子的 Kr 和 Xe 离子在 YBa2Cu3O6+δ 和第二相沉淀物中产生的线性辐射缺陷的化学成分和形态：分析热尖峰模型的实验和应用


对多层复合材料 Ag/YBa2Cu3O6+δ/LaMnO3/MgO/Y2O3/Al2O3/Hastelloy 暴露于能量为 E ≅ 0.04 至 E ≅ 0.8 MeV/核子的 Xe 和 Kr 离子后，进行了透射电镜、电子衍射、能量色散 X 射线光谱和电子能量损失光谱表征。研究了 YBa2Cu3O6+δ 和第二相沉淀物中线性辐射缺陷、轨迹的化学成分、形态和大小的变化。结果发现，无论离子能量如何，所有辐射缺陷都具有非晶结构，而化学成分的变化取决于终止离子和样品中原子的原子半径（或质量）。在所使用的离子能量范围内和样品中离子通过的距离（约 1 μm）内，每种材料的线性缺陷直径保持不变，并与材料参数相关。YCuO2 相记录了 10-12 nm 的最大轨迹直径，在所有研究化合物中，该相具有最低的密度、低熔点和最低的轨迹形成电子阻止力阈值。将实验测量的 YBCO 和第二相沉淀物的轨道直径与分析热尖峰模型的预测进行了比较。结果表明，对于简单的氧化钇和钇铜氧化物等电介质，离子的阻止能力超过 10 keV/nm，测量的直径与实验误差内的计算值一致或偏差不超过 10%。 在较低制动力下，观测到的轨道大小与计算的轨道大小之间的差异，以及轨道半径的定性行为取决于能量损失的矛盾，可能是由于与基本重要假设相关的热尖峰模型的不准确。