PC spectra of YNi5 intermetallic compound homocontacts and heteroconta
cts with Cu have been measured in the ballistic regime. Phonon maxima
at characteristic energies of 4, 8, 18 and 30 meV have been observed i
n the electron-phonon interaction function. The phonon parts of PC spe
ctra of RENi(5) (RE = La, Ce, Pr, Sm, Y) compounds with isomorphous la
ttice structure are similar which corresponds to small differences bet
ween lattice constants of these materials.