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how to calculate current density in ionic crystal under high electrical field

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Hi everyone, I have trouble calculating the current density (j) in ionic crystal caused by ion migration under high electric field (E), in which current density should be exponential with electrical field (j=Aexp(BE/kT)). However, in COMSOL, it is normal to calculate current density with conductivity sigma (j=sigma * E). I wonder whether there is suitable module to calculate current density that is exponential to electric field, rather than linear to electric field. Can anyone give me any tips? It would be greatly appreciated. Thanks in advance!


0 Replies Last Post 16.11.2020, 04:45 GMT-5
COMSOL Moderator

Hello Jingxian Li

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