getter

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getter

[′ged·ər]
(chemistry)
(physical chemistry)
A substance, such as thallium, that binds gases on its surface and is used to maintain a high vacuum in a vacuum tube.
A special metal alloy that is placed in a vacuum tube during manufacture and vaporized after the tube has been evacuated; when the vaporized metal condenses, it absorbs residual gases. Also known as degasser.

getter

In vacuum or gas-filled tubes, it is a small, ring or cup-shaped device containing a powdered metal that reacts strongly to oxygen. When the tube is sealed, the getter is fired (heated) to further evacuate a vacuum tube or to remove impurities from the gas. Firing causes the getter material to oxidize and absorb any free oxygen in the tube, which would otherwise oxidize the active electrodes and decrease the tube's life. Tubes with graphite-based electrodes do not use getters, because the graphite itself absorbs oxygen.

In a vacuum tube, the location of the getter is sometimes identified by a shiny silver deposit behind the glass, which is residue from the firing. The metal used in the getter depends on tube manufacturer, type and composition. Barium is an excellent oxygen absorber and is used in tubes with a fired getter. Zirconium and titanium, also used as getter material, oxidize from the tube's self-generated heat and do not require firing.
References in periodicals archive ?
The proceedings for GADEST 2013 contains 84 papers on such matters as defect engineering in silicon solar cells, structural and production issues in cast silicon materials for solar cells, characterizing silicon for solar cells, intrinsic point defects in silicon, light impurities in silicon-based materials, fundamental properties and gettering of metals in silicon, extended and implantation-related defects in silicon, germanium-based devices and materials, semiconductors other than silicon and germanium, and nanostructures and new materials systems.
Because iGEM(TM) enhances gettering at various levels of low resistivity, it should help device makers improve yields at the current resistivity levels they're working with, and be able to move to lower resistivity without sacrificing yield.
MDZ(TM) treated wafers also provide two other major device- manufacturing advantages: MDZ(TM) provides reliable internal gettering at lower thermal budgets, and it allows the elimination of several costly steps at the beginning of the device manufacturing process.
MDZT treated wafers also provide two other major device- manufacturing advantages: MDZT provides reliable internal gettering at lower thermal budgets, and it allows the elimination of several costly steps at the beginning of the device manufacturing process.
SAES Getters is the world leader in the production of gettering devices, special alloy based components used to improve and maintain very high vacuum in cathode ray tubes, used in TV sets and computers, lamps, industrial and scientific applications.
This agreement confirms the willingness of SAES Getters to remain at the forefront of vacuum and gettering technology.