Deuterium storage in FeTi. Measurement of desorption isotherms and structural studies by means of neutron diffraction

摘要: Abstract Activation of pure stoichiometric FeTi turned out to be difficult and deactivation processes due gas impurities limit the hydrogen storage capability. Isotherms deuterium desorption are reported for temperature range T = (25÷70)°C. At room crystal structures FeTiD x (x 0÷1.74) FeTiH 0.78 D 0.22 were investigated by means neutron diffraction at 2 -pressures up 84 bar. Deuterium absorption in yields ternary deuterides is associated with symmetry reduction corresponding considerable distortions CsCl-type metal structure. In occupies octahedral sites two iron four titanium atoms as nearest neighbour coordination (space group P222 1 or P c ). Hydrogenation does not change essentially order parameter FeTi.