Abstract
The interaction of Er 3Ni with hydrogen was studied in the temperature range of 293-243 K. The reaction at room temperature and hydrogen pressure of 20 atm leads to formation of amorphous hydride phase. Hydriding Er 3Ni at the low temperature (253-243 K) and low pressure (<1 atm) leads to synthesis of individual hydride with formula Er 3NiH 8 and structure of initial intermetallic compound. Hydride, formed in this condition has a high degree of crystallization. It is indexed orthorhombicaly and the lattice constants have been measured. The exposure to vacuum of formed hydride for a few hours at the temperature of 873 K does not recover of initial intermetallic phase, but it is characterized by disproportionation to ErNi and ErH 2. The interaction of Er 3Ni with nitrogen was studied at the pressure up to 40 atm in the temperature range of 873–1073 K. The magnetic properties of the crystalline Er 3Ni and Er 3NiH 8 in the paramagnetic region are reported.
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