Ea. Shadchin et Ai. Barabash, GEOMETRIC ISOTOPE EFFECT AND CURIE-TEMPERATURE IN HYDROGEN-CONTAININGFERROELECTRIC-CRYSTALS, Journal of molecular structure, 325, 1994, pp. 59-64
The mutual effect of protons (deutrons) and heavy ions is examined wit
hin the limits of adiabatic approximation. The dependence of the lengt
h of the hydrogen bond on the proton state function is obtained. It is
shown that the mutal effect of the proton and ion subsystems, taken i
nto account by adiabatic corrections, should increase the phase transi
tion temperature.