Getter films with a reactive component

Chuntonov, Konstantin; Иванов, А. П.; Permikin, D.

doi:10.1016/j.vacuum.2010.11.011

Cited by 2 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Developing materials for gas trapping and storage is of the utmost importance for several technologies including clean energy applications, noble gas separation, carbon sequestration, and removal of residual gases in vacuum cavities or chambers. − Such materials are very reactive and specifically designed with high porosity and nano- and microsized pores, to allow high gas sorption capacities. , Their functionality and gas selectivity can be tailored through material design and engineering for specific applications. Structural selectivity rises from the pore size distribution within the material that preferentially traps certain molecules, a behavior known as molecular sieving. , Chemical selectivity, on the other hand, originates from the nature of interaction between impinging gas molecules and atoms present on the surface, which is governed by thermodynamics constraints .…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent in Situ Studies of Volatile Molecule Trapping in Low-Temperature-Activated Zr Alloy-Based Getters

Abboud

Moutanabbir

2017

J. Phys. Chem. C

View full text Add to dashboard Cite

The activation process and the gettering mechanisms of Zr−Corare earth metal alloy getters were investigated. The evolution of the surface composition prior to and upon exposure to volatile molecules (O 2 , N 2 , CO 2 ) was monitored in situ using X-ray photoelectron spectroscopy under annealing conditions compatible with low processing temperature regimes. The thermally activated process of surface oxygen diffusion into the bulk was elucidated and found to involve an activation energy of 0.21 ± 0.02 eV in the 200−350 °C temperature range. This activation process was also found to reversibly transform ZrO 2 into Zr(OH) 2 through the interaction with thermally desorbed hydrogen. Carbidic species form upon annealing at 250 °C via the interaction with an adventitious carbon layer on the surface, which results in the decrease in the number of surface sites available for subsequent gettering. In situ studies of the material reactivity with high purity O 2 , N 2 , and CO 2 were also investigated. O 2 was found to saturate the surface after single exposure, while CO 2 dissociates into CO and O − , where O − is incorporated deeper in the material and CO forms an ad-layer on the surface of the getter. N 2 was found to weakly interact with the partially activated surface and to form ZrN only upon annealing the sample to 350 °C indicating the poor reactivity of the material with N 2 at room temperature. The results display the importance of ridding systems of residual gases, especially N 2 , by properly degassing the system prior to sealing to minimize and/or eliminate trapped gases within devices during operation.

show abstract