diffusion barrier


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diffusion barrier

[də′fyü·zhən ‚bar·ē·ər]
(chemical engineering)
Porous barrier through which gaseous mixtures are passed for enrichment of the lighter-molecular-weight constituent of the diffusate; used as a many-stage cascade system for the recovery of 235UF6 isotopes from a 238UF6 stream.
References in periodicals archive ?
As shown in Figure 9, variations in the relative orientation of the preferred elongation axis can result in a shift of the diffusion barriers by two orders of magnitude at low temperatures.
The coating consisted of a system of Cr/Ni/Ag layers, where the tin layer exerted adhesive function, the nickel layer forms a diffusion barrier and the nickel layer assures a good solderability and spreadability in a short time (Fig.
Threshold strain of the strips coated by dual layers of NiCr and titania were significantly improved, possibly by its diffusion barrier performance to hydrogen.
Hsu; The Effect of Deposition Temperature on the Properties of TiN Diffusion Barriers Prepared by Atomic Layer Chemical Vapor Deposition, Thin Solid Films: 485(1-2), 59-65 (2005).
Thus, it is clear that, for the best diffusion barrier, one should use as much clay with as large an aspect ratio as possible.
On the other hand, microfissuring during film crystallization (discussed above) removes this diffusion barrier, accelerating penetration by [Al+.
The palladium forms a diffusion barrier between the chromium adhesion layer and the gold conductor.
In addition, poisoning of diamond growth by cobalt is inhibited with a cobalt diffusion barrier, resulting in coatings with improved adhesion.
The copper die bumps permit use of a simplified under bump metallization (UBM) since the diffusion barrier requirements of the UBM are no longer required.
Air pollutants must pass a boundary layer around the interface of the air and the passive sampler, a stagnant region produced by a diffusion barrier and a boundary layer at the collector.
The new Japanese patent, number JP 3731932 B, is titled "Silicon Carbide Metal Diffusion Barrier Layer".