论文标题
硅酸盐玻璃中的低温成核速率异常是伪影
The Low-Temperature Nucleation Rate Anomaly in Silicate Glasses is an Artifact
论文作者
论文摘要
在过去的40年中，大量硅酸盐玻璃中成核速率的测量表明，对于低于峰值成核速率的温度，广泛使用的经典成核理论（CNT）的分解。数据表明，关键集群形成的工作并没有随着温度降低而稳步降低，甚至开始增加。尽管已经提供了许多解释来解释这一异常，但没有一个提供令人满意的答案。我们提出了第一个实验结果，表明异常不是真实的，而是由于低温下退火时间不足而产生的伪像。时间依赖性成核速率是在5bao.8sio2玻璃中测量的。8SIO2玻璃在峰值成核速率温度以下的温度下，比硅酸盐玻璃的任何以前的测量时间长很多倍。新数据给出了与CNT预测一致的结果。由于在许多硅酸盐玻璃中广泛观察到伪影，因此这些结果表明，低温下现有的成核率数据不正确。
Over the past 40 years measurements of the nucleation rates in a large number of silicate glasses have indicated a breakdown in the widely used Classical Nucleation Theory (CNT) for temperatures below that of the peak nucleation rate. The data show that instead of steadily decreasing with decreasing temperature, the work of critical cluster formation enters a plateau, and even starts to increase. While many explanations have been offered to explain this anomaly, none have provided a satisfactory answer. We present the first experimental results that demonstrate that the anomaly is not real, but is instead an artifact arising from an insufficient annealing time at the low temperatures. The time-dependent nucleation rate was measured in a 5BaO.8SiO2 glass at a temperature 50 K below the peak nucleation rate temperature for a time many times longer than any previous measurement time for a silicate glass. The new data give results that are consistent with the predictions of the CNT. Since the artifact has been widely observed in many silicate glasses, these results indicate that much of the existing nucleation rate data at low temperatures are incorrect.
