Investigation of the decay of the “frozen” nonequilibrium state of indium films with high hydrogen concentration

An electron-diffraction study of indium films, obtained by deposition in a hydrogen atmosphere (with pressures of PH2=1.4×10−5−1×10−4 torr) on a substrate cooled with liquid helium to a temperature of ∼3.5 or ∼4.5 K, was performed. The measurements of the interplanar distances enabled the hydrogen concentration in the crystals to be determined. It was found that dissolved hydrogen decreases the tetragonal distortion of the indium lattice up to the point at which it becomes completely cubic. Attention is given mainly to the study of the decay of the nonequilibrium phase In (H) with high hydrogen concentration, stabilized by means of an external layer of solid hydrogen. It was found that the starting state of the In (H) phase is labile, and the initial stage of the decay of this state has a spinodal character. The internal stresses in the films, arising as a result of the spinodal decay, are analyzed. Both homogeneous compression of the entire film and the appearance of nonuniform microstresses, which are balanced within separate crystallites, were observed. The data obtained indicate the high mobility of hydrogen in indium films at low temperatures < 5 K).

Ҳали таржима қилинмаган