Experimental Evaluation of Inter facial Segregation between Liquid Alloys and Molten Salt by using Electro-chemical Capillarity

电化学毛细管现象评价液态合金与熔盐界面偏析的实验

基本信息

批准号：
12650734
负责人：
TANAKA Toshihiro
金额：
$ 1.54万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650734/
关键词：
Surface segregation Ga-Bi alloys KCl-LiCl molten salt mixture Surface tension Interfacial tension

项目摘要

Although the interfacial segregation between liquid alloys and molten salt is recognized from a thermodynamic view point, the phenomenon can not be seen directly by using any experimental method. This segregation occurs within a few atomic layers. Since the electro-chemical capillarity is quite sensitive to the change of the physico-chemical properties in the above very small atomic region, the interfacial segregation might be detected by using the electro-chemical capillarity. In the present work, the experimental apparatus for the electro-chemical capillarity was made, and then the interfacial excess electric charge between liquid alloys and molten salt was measured to confirm the above interfacial segregation between these two liquid phases. First of all, the electro-chemical capillary curves were measured for molten LiCl-KCl systems and liquid Ga-Bi alloys, of which compositions of Bi were changed. Then, the relationship between the interfacial excess electric charge and the bulk composition of Bi in liquid Ga-Bi alloys was obtained, which corresponded to the relation between the surface segregation and the bulk composition of Bi in liquid Ga-Bi alloys. Thus, it was found from the above experiments that the interfacial segregation between liquid alloys and molten salt can be evaluated from the measurement of the electro-chemical capillarity.

尽管从热力学角度认识到液态合金和熔盐之间的界面偏析，但使用任何实验方法都无法直接看到这种现象。这种分离发生在几个原子层内。由于电化学毛细管现象对上述非常小的原子区域的物理化学性质的变化非常敏感，因此利用电化学毛细管现象可以检测界面偏析。在本工作中，制作了电化学毛细管现象的实验装置，然后测量了液态合金和熔盐之间的界面过剩电荷，以证实这两种液相之间的上述界面偏析。首先，测量了熔融LiCl-KCl体系和液态Ga-Bi合金（其中Bi的成分发生变化）的电化学毛细管曲线。然后，得到了界面过剩电荷与液态Ga-Bi合金中Bi的块体成分之间的关系，该关系对应于液态Ga-Bi合金中Bi的表面偏析与块体成分之间的关系。因此，从上述实验发现，可以通过电化学毛细管现象的测量来评价液态合金和熔盐之间的界面偏析。