The hydrogen distributions in the amorphous $Nb_{40}Ni_{60}$ alloy were investigated by using the hydrogen thermal analysis technique. The hydrogen distributions are determined by the Fermi-Dirac statistics and the pressure-concentration isotherms show positive deviations from Sievert's law at temperatures between 100°C and 250°C for hydrogen pressures between 0.05 atm and 1 atm. The deviations is attributed to the larger enthalpy of dissolution at higher concentrations, which is related to the distribution of hydrogen atoms in sites of different energies. The dissolution of hydrogen is exothermic.
From the results of the hydrogen thermal analysis in amorphous. $Nb_{40}Ni_{60}$ alloy, the number of lower energy, $Nb_4$, sites decreases as the charging temperature decreases. This decrease is thought to be the result of the temperature dependence of the chemical short range order.
