Diffusion of Nonvolatile Metallic Elements in Graphite
作者:James R. Wolfe、Donald R. McKenzie、Richard J. Borg
DOI:10.1063/1.1714374
日期:1965.6
relative insolubility of metals in graphite. Experimental evidence is presented which indicates that substitutional, pore, and interstitial diffusion are inoperative and that all mass transport proceeds solely via grain and subgrain boundaries. The activation energies and frequency factors are explained by a diffusion model involving widely spaced traps which are situated at imperfections.
Ag、Ni、U、Th 和 Ra 在各种类型的石墨中扩散的扩散系数已确定为温度的函数。在所有情况下都获得了良好的精度,并报告了相应的活化能。当可以进行比较时,这些值与先前报告的值不一致。基于金属在石墨中的相对不溶解性,对缺乏一致性给出了解释。实验证据表明置换扩散、孔隙扩散和间隙扩散不起作用,并且所有质量传输仅通过晶界和亚晶界进行。活化能和频率因子由扩散模型解释,该模型涉及位于缺陷处的大间距陷阱。