Abstract
The principal coordinate systems of electric field gradient (EFG) at deuteron sites in hydrogen bonds are obtained at -120°C by means of Volkoff method. The shift in angle of 10 degrees is found in the orientation of the principal z axis of EFG at two of four inequivalent sites, and about 3 degrees at the other two sites. These shifts are attributable to the rotational displacement of SO 4 ions. The temperature dependence of the resonance line separation is measured in the ferroelectric phase with the magnetic field parallel to the crystalline a axis. It is found that this temperature dependence, that is, the temperature dependence of EFG is proportional to the spontaneous polarization obtained in the present study by the pyroelectric method. In the limited temperature range, from -30 to -100°C, the separation of resonance lines and the spontaneous polarization depend on temperature as ( T c - T ) β , with β of 0.33.
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