Relationship Between zeta-Potential and Dislocation Mobility.

摘要

A study has been made of the environment sensitivity of edge and screw dislocation motion around hardness impressions on (100) surfaces of monocrystals of MgO immersed in buffered aqueous NaCl,and of LiF immersed in water,toluene and dimethyl formamide. It is shown that for MgO edge and screw dislocation mobilities are least,and hardness greatest,when the zeta potential is near 0,thus providing a further example of the correlation between zeta-potential and hardness established in recent studies of a variety of inorganic non-metals. This study shows specifically,however,that the 'zeta-correlation'extends also to dislocation mobility. For LiF,it is established that both near-surface edge and screw dislocation mobilities are environment-sensitive. (Modified author abstract)