On The System Europium Ammonia Hydrogen Graphite

The preparation, at low temperatures by the Rüdorff method, of quaternary cointercalates containing Eu-, NH 3 - and H-guest particles is described. The stoichiometry of the blue phase is wide. Longer reaction times increase the Eu and H contents. The Mössbauer spectra show a mixture of Eu 2+ and Eu 3+ at room temperature. The intensity of the Eu 2+ line decreases in the higher stage compounds. Irreversible reorganisation in the guest layers is observed.