The hydrogen distributions in the amorphous $Fe_{40}Ni_{38}Mo_4B_{18}$ alloy were investigated and compared with those in the amorphous $Pd_{80}Si_{20}$ alloy to study the effect of the chemical environment around interstial sites on the site energy distribution.
The hydrogen thermal analysis technique was used to study the hydrogen distributions in the interstitial sites of amorphous $Fe_{40}Ni_{38}Mo_4B_{18}$, it was shown that at low temperature and high concentration, the hydrogen distribution is determined by Femi-Dirac statistics and, at higher temperatures or low concentrations, follows Maxwell-Boltzmann statistics.
From the same results as those for amorphous $Pd_{80}Si_{20}$ alloy, it was concluded that the hydrogen distribution in the interstial sites is determined by the physical nature of the structure itself, that is, hole size distribution than by the alloy composition, that is, the chemical environment around interstial sites.