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 ?
Void formation in porous ULK, also seen in Figure 2, illustrates the need for control of the queue-time between the CMP and dielectric diffusion barrier process steps.
Figure 2 shows the integration of a multi-layer diffusion barrier beneath the dense ULK film.
Figure 2 shows a 65nm device cross section with both dielectric diffusion barrier and contact etch stop layers deposited using the MSSP approach.
Non-phos palladium, by contrast, has a crystalline structure and is far from an ideal diffusion barrier.
impurity diffusion barriers were so far achieved with CIGS growth processes at
The protective effect is attributed to the formation of molten glass layer on steel surface at high temperature, which acts as an effective oxygen diffusion barrier.
The dissolvable solderable coating for electronics mostly consists of an adhesive layer (Cr, Ni, Ti, Al) diffusion barrier (Ni, Cr, Pt Pd) and a solderable layer (Ag, Au, Cu, Ni).
For a given acid challenge, drastically different lesion solution compositions (5-7) and overall rates of demineralization (7) were obtained as the permselective characteristics of the diffusion barrier were varied.
The annulus of the mouse sperm tail is required to establish a membrane diffusion barrier that is engaged during the late steps of spermiogenesis," Biology of Reproduction 82(4): 669-678.
Generally, infants born with the disease have defects in the normal air-blood diffusion barrier in their lungs.
The most common diffusion barrier that can impact on results interpretation is edema around the wound site.
That's one area where he and his colleagues believe the clay nanoparticles will help--by acting as a diffusion barrier, to slow the progress of the supercritical C[O.