electromigration

(redirected from Metal migration)

electromigration

[i¦lek·trō·mī′grā·shən]
(analytical chemistry)
A process used to separate isotopes or ionic species by the differences in their ionic mobilities in an electric field.
(physical chemistry)
The movement of ions under the influence of an electrical potential difference.

electromigration

(electronics)
Mass transport due to momentum exchange between conducting electrons and diffusing metal atoms. Electromigration causes progressive damage to the metal conductors in an integrated circuit. It is characteristic of metals at very high current density and temperatures of 100C or more.

The term was coined by Professor Hilbert Huntington in the late 1950s because he didn't like the German use of the word "electrotransport".

Mass transoport occurs via the Einstein relation J=DFC/kT where F is the driving force for the transoport. For electromigraiton F is z*epj and z* is an electromigration parameter relating the momentum exchange and z is the charge of the "diffusing" species.
References in periodicals archive ?
The Effect of HCl Concentration in Dispersed Phase on Rare Earth Metal Migration. The concentration difference of H+ in material liquid phase and dispersed phase is the mass transfer dynamic in DSLM for rare earth metal.
The exact physical origin for this reduced [V.sub.SET] is out of the scope of this work but there is plenty of evidence pointing to (1) the chemical reduction of [Al.sub.2][O.sub.3] into off-stoichiometric [Al.sub.x][O.sub.y] after oxygen scavenging by the BE/TE metal layers [13, 14] (thus decreasing the total dielectric constant) and/or (2) metal migration from the BE/TE into [Al.sub.2][O.sub.3] so that a localized conductive nanofilament (formed by a SET process) could be partially dissolved by a RESET process [6, 7], thus reducing both the effective oxide thickness and the next [V.sub.SET] needed for a new HRS [right arrow] LRS transition (see Figure 7(a)).
How big the void must be to cause metal migration and electrical failure depends roughly on the diameter of the void and its location in relation to adjacent metal layers.
Cities and towns serve as sources of technogenic substances for the heavy metal migration. Fate of pollutants in the urban environment depends on internal (chemical, toxicological) and external (geochemical conditions of migration, geochemical barriers, landscape conditions) factors (Kasimov, Lychagin 1998).
Stoke-on-Trent, United Kingdom, April 30, 2015 --(PR.com)-- The comprehensive handbook indexes the regulations or standards for over 80 countries and economic areas, listing the relevant test methods and metal migration limits in an easy-to-use table.
XSense offers the same copper metal mesh advantages as UniPixel's InTouch sensors, which include lower resistance for better noise immunity and lower power consumption, as well as higher reliability that avoids silver metal migration.
Electrolytic metal migration. In the presence of moisture and an electric field, electrolytic metal migration occurs when metal ions migrate to a cathodically (negatively) charged surface and form dendrites.
A crack, like a void, also can experience metal migration and become plated.
The chip could handle 25 mA per pin, but the resulting stress and metal migration might lead to premature failures.
Nesbitt, and R.M Quigley (1988), "Heavy Metal Migration at a Landfill Site in Sarnia, Ontario, Canada - 2: Metal Partitioning and Geotechnical Implications," Appl.
The waste leaching columns were connected to soil columns to study the metal migration through soils in a continuous flow system.
The first relates to storage life failures: hermeticity prolems (TWTs that "gas up"), material problems due to static loadings (plastic tension seals that take permanent sets), time/temperature-driven metal migration and structural fatigue/deformation.