ELECTROMIGRATION
\ɪlˌɛktɹə͡ʊmɪɡɹˈe͡ɪʃən], \ɪlˌɛktɹəʊmɪɡɹˈeɪʃən], \ɪ_l_ˌɛ_k_t_ɹ_əʊ_m_ɪ_ɡ_ɹ_ˈeɪ_ʃ_ə_n]\
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Mass transport due to momentum exchange betweenconducting electrons and diffusing metal atoms.Electromigration causes progressive damage to the metalconductors in an integrated circuit. It is characteristicof metals at very high current density and temperatures of100C or more.The term was coined by Professor Hilbert Huntington in thelate 1950s because he didn't like the German use of the word"electrotransport".Mass transoport occurs via the Einstein relation J=DFC/kTwhere F is the driving force for the transoport. Forelectromigraiton F is z*epj and z* is an electromigrationparameter relating the momentum exchange and z is the chargeof the "diffusing" species.
By Denis Howe
Word of the day
Dopamine Acetyltransferase
- An enzyme that catalyzes the of groups from acetyl-CoA to arylamines. They have wide specificity for aromatic amines, particularly serotonin, and can also catalyze acetyl transfer between arylamines without CoA. EC 2.3.1.5.