固液界面温度的一种测量方法

固液界面处温度的精密测量是晶体生长动力学研究的一个重要实验数据。本实验设计了一种适合于偏光显微镜用的温度调节试样台,用直接动态观察法,借助于直径25微米的铜-康铜热电偶,测量了水杨酸苯酯晶体的固液界面附近的温度分布。在△T<3℃的低过冷度的生长条件下,铜制试样台的热量输运条件稳定。固液界面处的温度增加值约为熔液过冷度的1％。这种温度调节试样台适合于生长机理的高精度定量实验研究。 关键词：

AN EXPERIMENTAL METHOD OF MEASURING THE CRYSTALLIZATION FRONT TEMPERATURE

In studying the kinetics of crystal growth from the melt, it is extremely important to measure the crystallization front temperature. In order to carry out in situ observations of growth around room-temperature, a thermally regulating stage on polarized-light microscope was constructed. The temperature at the crystallization front of salol was measured by a c.c, thermocouple with diameter 25 μm. The results of measurement showed that using present apparatus, the rate of latent heat removal was constant in a supercooling stationary melt in the range of △T<3.0℃. The increament of temperature at the front was about 1% of the supercooling in the melt bulk.The thermally regulating stage we designed can be useful in the study of the kina-tics of crystal growth.