抄録
The activation energy of dielectric critical relaxation in CsH2(1−x)D2xPO4 (x=0–0.98) has been examined, using the reported values of the relaxation time τ and the static dielectric constant εs which satisfy the relation τ⁄εs=ν−1 exp (ΔU⁄kT) except in the vicinity of the Curie temperature. The activation energy ΔU increases pronouncedly with the increase in the deuteron concentration x, whereas the frequency factor ν remains unchanged. By applying the kinetic quasi-one-dimensional Ising model by Zumer, it is found that the remarkable increase in ΔU with deuteration is attributable to the increase in J⁄⁄, where J⁄⁄ is the intrachain coupling parameter between the nearest neighbor dipoles.
