Hydrogen interaction with Zr-based getter alloys in high vacuum conditions: In situ SIMS-TPD studies

The paper summarizes the results of combined SIMS-TDS measurements of hydrogen interaction with the alloys Zr2Fe, Zr(V0.75Fe0.25)(2), Zr65V30Ti5, Zr37.7Ti4.7Mn20.2Fe37.4 at hydrogen pressures below 1 x 10(-2) Pa, and in temperature range similar to 300 divided by 1100 K. Hydrogen is readily chemisorbed on the sputter-cleaned surface of the alloys. Besides chemisorption, substantial hydrogen uptake into the bulk was observed for Zr2Fe, Zr(V0.75Fe0.25)(2), Zr65V30Ti5, but almost no uptake for Zr37.7Ti4.7Mn20.2Fe37.4. Temperature increase above 300 K resulted in the increase of the hydrogen absorption effectiveness and its dissolution rate from the surface into the bulk indicating the surface-to-bulk transition and/or bulk diffusion rate as the absorption limiting steps. Hydrogen release from the alloys was observed at temperatures above 600 K. Its beginning temperature depended on the amount of hydrogen absorbed and the alloy composition. The comparative effectiveness of hydrogen absorption by the alloys decreased in the sequence Zr65V30Ti5 > Zr(V0.75Fe0.25)(2) > Zr2Fe.

Automated summary

This study summarizes the results of combined SIMS-TDS measurements on the interaction of hydrogen with various alloys at hydrogen pressures below 1 x 10(-2) Pa and temperatures ranging from 300 to 1100 K. The alloys showed varying levels of hydrogen absorption effectiveness and release temperatures, with different mechanisms such as chemisorption and bulk diffusion being involved. The comparative effectiveness of hydrogen absorption by the alloys followed the sequence Zr65V30Ti5 > Zr(V0.75Fe0.25)(2) > Zr2Fe.