Distribution of Site Energies in Amorphous Ni—Zr and Ni—Ti Alloys*

Solid Solutions of Hydrogen in Complex Materials

“…Then the average site energy E i for the A i B 4-itetrahedron increases with increasing i for A being the late transition component. This expectation is in agreement with experimental findings [120,121]. By using the step approximation of the FD-Statistics, i.e.…”

“…The chemical diffusion coefficient of hydrogen in early transition/late-transition metallic glasses is increasing with increasing concentration [120]. However, in the ascending curves of D vs. c plots there is a dip at those concentrations, where a sub-set of tetrahedra of the type A i B 4-i is filled and the energetically less favorable type A i+1 B 3-i has to be occupied.…”

Hydrogen solution properties in a series of amorphous Zr–Hf–Ni alloys at elevated temperatures

“…As is generally known for amorphous alloys [10,[12][13][14][15], the amorphous alloys studied here show no plateau, suggesting no ␣-␤ phase transition in this pressure range. Because the ␣-␤ phase transition often brings spontaneous pulverization or degradation of mechanical strength, the lack of an ␣-␤ phase transition can be regarded as an advantage of amorphous alloys in membrane applications, where the membrane must retain its shape even under the mechanical force caused by the pressure difference between both sides of the membrane.…”

“…More complicated functions have been proposed to explain the amorphous alloy behavior, where several Gaussian functions were superimposed [15,18]. However, without such a compli- cated function, the concentration can be reproduced in this study.…”

Hydrogen and Zr-based metallic glasses: Gas/solid absorption process and structure evolution

“…They proposed a sequential filling by hydrogen atoms of pre-existing sites of different energies, for Zr-Ni alloys the sequence of site filling is Zr 4 then Zr 3 Ni then Zr 2 Ni 2 and so on. Nevertheless, several authors reported experimental measurements that are incompatible with a "static" random-alloy model [20][21][22][23]. They underlined that the initial atomic configuration of the amorphous alloy is not frozen and can evolve in the presence of hydrogen.…”