Fascinating short 'work in progress' paper from my friend Vladimir Dubinko.
In both installations, the NdFe10, NdFe20 films readily absorbed hydrogen up to a loading ratio of ~1÷2 per metal atom, while their thermal response to the loading depended crucially on the total mass of the films. A fierce exothermic reaction was detected, which resulted in the melting of the Cu foil, in which the films have been wrapped, provided that the total mass of the films exceeded the critical value of ~ 1 gram. Bellow the critical mass, the films absorbed hydrogen up to a similar loading ratio ~1.5÷1.6 per metal atom without a noticeable rise of their temperature. The quantitative results of our experiments are presented below.