MOSSBAUER EXPERIMENTS WITH FE-57 AND CO-57 IN PALLADIUM HYDRIDE - DIFFUSIONAL RELAXATION AND HIGH HYDROGEN CONCENTRATIONS

Palladium hydrides with hydrogen-to-metal ratios close to unity were p repared under hydrogen pressures up to 7 GPa and studied by Fe-57 Moss bauer spectroscopy. In highly loaded absorbers the iron probes were fo und to be practically always surrounded by six hydrogen neighbours des pite the repulsive iron-hydrogen interaction. In the emission spectrum of a source of Co-57 in PdHx the diffusional relaxation of the typica l hydrogen environment of cobalt to that of iron was observed between 200 and 300 K.