Abstract
Dielectric constant and hysteresis loops measurements in NaH 3(SeO 3) 2 show the existence of thermal hysteresis accompanying both phase transitions which appear at -79° and -180°C. The most reliable values obtained from ϵ vs. T curves give estimates of ΔT = 3.2° C and ΔT = 20.1° C, respectively. Assuming that a double potential well along the hydrogen bonds is responsible for the dipole ordering, it is possible to correlate the thermal hysteresis with the discontinuous disappearance of spontaneous polarization and the height of the potential barrier. Estimated energies for the potential barriers in both transitions yield values which are reasonable for a short hydrogen bond.
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