For deeply supercooled liquids the transition from a two-stage freezing process to complete solidification in just one freezing step occurs at the hypercooling temperature, a term that seems to be almost unknown in water research; to our knowledge, it has only been mentioned by Dolan et al. for high-pressure ice. The reason for the absence of this expression may be that the best estimate to be found in the literature for the hypercooling temperature of water is about −160 °C (113 K). This temperature is far below the limit of experimentally realizable degrees of supercooling near −40 °C (233 K), which marks the homogeneous nucleation temperature T_H of common pure water; in fact, it is even below the glass-transition temperature (133 K). Here we show that, surprisingly, a more thorough analysis taking into account the temperature dependence of the heat capacities of water and ice as well as of the enthalpy of freezing shows that the hypercooling temperature of water is about −64 °C or 209 K, almost 100 K higher than estimated before. One of the most exciting consequences is that existing experiments are already able to reach these degrees of supercooling, and it is our prediction that a transition in the freezing behavior occurs at these temperatures.

中文翻译：

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水的过冷温度比之前计算的温度高约100 K

对于深度过冷的液体，在过冷温度下会发生从两阶段冷冻过程到完全凝固的转变，仅需一个冷冻步骤，这个术语在水研究中似乎几乎是未知的。据我们所知，只有Dolan等人提到过它。用于高压冰。缺少该表达式的原因可能是，对于水的过冷温度，在文献中找到的最佳估计值约为-160°C（113 K）。该温度远低于−40°C（233 K）附近实验可实现的过冷度的极限，这标志着均匀成核温度T _H普通的纯净水；实际上，它甚至低于玻璃化转变温度（133 K）。令人惊讶的是，在这里我们发现，结合水和冰的热容量以及冻结焓的温度依赖性进行的更彻底的分析表明，水的过冷温度约为-64°C或209 K，比以前估计的要高近100 K 最令人兴奋的结果之一是，现有实验已经能够达到这些过冷度，并且我们的预测是在这些温度下会发生冻结行为的转变。