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Radiation damage in NaCl:the annealing behaviour of heavily damaged KBF4 doped crystals

机译：NaCl中的辐射损伤：严重损坏的KBF4掺杂晶体的退火行为

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In this paper the annealing of Na colloids in heavily irradiated NaCl with damage levels up to 10 mol% is discussed. Recently the melting properties of Na colloids in heavily irradiated NaCl have been studied using differential scanning calorimetry. The observation of three endothermal latent heat peaks, numbered 1, 2 and 3, as a function of the dose, has been reported. Here we discuss the annealing behaviour of heavily irradiated crystals doped with KBF4, which show a large melting peak 3. The changes in the appearance of the latent heat peak provide us with information about the properties of the sodium colloids. The annealing of the colloids in two different temperature ranges is described. At moderate annealing temperatures between 160 and 210 °C the peak shifts with annealing time to lower melting temperatures very rapidly. The shift of the peak is activated by an energy of 1-1.4 eV and strongly depends on the initial amount of latent heat. At high temperatures between 250 and 320 °C a decrease of the latent heat is measured, due to the back reaction between Na colloids and molecular Cl2. After continued annealing at high temperatures the melting behaviour becomes very anomalous. The melting peak splits into two peaks, the main peak and a new, sharp one arising at 92 °C. After the splitting of the peak the back reaction slows down significantly, activated by an energy of 1.2 ± 0.3 eV. Both the moderate and high-temperature annealing behaviour indicate that the processes are very local, with a short length scale of the order of 1 nm. This implies that the morphology of this type of colloid is highly irregular, with a dense and fine nanostructure.
机译：本文讨论了Na胶体在强辐照NaCl中的退火，损伤水平最高为10 mol％。最近，已经使用差示扫描量热法研究了Na胶体在强辐射NaCl中的熔融特性。据报道，观察到三个吸热潜热峰，分别为1、2和3，与剂量有关。在这里，我们讨论掺有KBF4的重辐照晶体的退火行为，该晶体表现出大的熔融峰3。潜热峰的外观变化为我们提供了有关钠胶体性质的信息。描述了在两个不同温度范围内胶体的退火。在160至210°C的中等退火温度下，峰会随着退火时间的变化而迅速降低熔融温度。峰的移动被1-1.4 eV的能量激活，并且在很大程度上取决于潜热的初始量。在250至320°C的高温下，由于Na胶体与分子Cl2之间的逆反应，导致潜热降低。在高温下连续退火之后，熔融行为变得异常。熔融峰分为两个峰，一个是主峰，另一个是在92°C出现的新峰。峰分裂后，由1.2±0.3 eV的能量激活，反作用力显着降低。中度和高温退火行为均表明该过程非常局限，短尺度为1 nm。这意味着这种胶体的形态高度不规则，具有致密而精细的纳米结构。

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