The main characteristics of the improved static gas-sorption method are constant gas flow and variable pressure above the getter surface. An inert SRG is used for adjusting and in situ calibrating gas flow by the rate of pressure rise method as well as for measuring pressure above the getter surface. During the sorption test non-getterable gases (noble gases and CH4) may accumulate in the test chamber. Few interruptions of the test gas flow enable measuring the change in background pressure. At the end of test, the analysis of gas composition by the gas-burst method using RGA is performed.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 792234To study O diffusion in NEG St 707 in the form of pills compressed from powder of typical particle size 50 to 100 µm the samples were loaded at 450 and 500 °C with different amount of O (from 0.6 to 18 at.%). Diffusion of O at 450 °C was too slow to show observable distribution of O inside the NEG. Observable effects were obtained at 500 °C The EDS analysis confirmed that St 707 is biphasic (grains of pure Zr and Laves phase Zr(V0.83Fe0.17)2) before and after heating to 500 °C. It also showed increased O concentration in the Laves phase and particularly at the boundaries of getter particles.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 776618