K-1-x(NH4)(x)H2PO4 (KADP) mixed crystals exhibit proton-glass behaviou
r over a certain composition range. The results of neutron-diffraction
, high-resolution inelastic and quasielastic neutron scattering studie
s of KADP are presented. The anomalous behaviour of the proton glass s
ystem (0.2 less than or equal to x less than or equal to 0.8) is discu
ssed.