Abstract
The complete isotope effect and quantum paraelectricity in hydrogen-bonded crystals of the ${\text{K}}_{3}\text{H}{({\text{SO}}_{4})}_{2}$ group are usually attributed to the proton tunneling and geometric isotope effect. However, a mechanism of the quantum effects is not unambiguously determined because neutron-scattering experiments indicate different forms of hydrogen-bond proton potential. The quantum effects and contradictory experimental results are accounted for by the model where the proton potential is strongly affected by a low-frequency heavy-atom mode.
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