Strain and resistivity of PdHx at hydrogen composition x > 0.8

Measurements of lattice expansion and electrical resistance versus hydrogen concentration, x = H/Pd, in a continuous range of stoichiometry [0 ≤ x ≤ 1.16] in the PdHx stretched system have been performed. High hydrogen compositions were achieved using electrochemical H loading procedure which allowed stable PdHx systems to be obtained.Strain of only 1.2% from pure Pd to PdH1.16 due to the isotropic lattice expansion has been reported; the observed trend is in disagreement with the scant literature data available. The resistivity of PdHx system in function of H content has been also investigated and discussed.