ИСТИНА

Intermetallic compounds (IMC) with RNi3 (R-Dy, Ho) composition are able to absorb reversibly a large amount of hydrogen and are perspective materials for hydrogen energy. Most of these compounds have PuNi3 (space group R-3m, no 166) structure type and consists of structural fragments with RT2 (MgZn2 structure type) and RT5 (CaCu5 structure type) composition, arranging in the direction perpendicular of the z crystallographic axis. For the duration of the hydride formation atoms of hydrogen occupy different sites in the crystal lattice of intermetallic compound.For the study of hydride structure and hydrogen atoms distribution in the crystal lattice usually apply of the neutron diffraction method. In our case for neutron study were used DyNi3 and HoNi3-based samples containing deuterium with low concentration (about 1.0 D/IMC). Neutron diffraction analyses at low temperature shown that these samples don’t contain hydrogen atoms. This indicates that after fast quenching at low temperature samples became unstable and desorbed all hydrogen