“Hamidashi” (Bulging-out) Effect in NaNO₂

抄録

The domain reversal in NaNO₂ by a dc electric field was found to occur in a very wide region outside the electrodes as well as the region under the electrodes, more remarkably in the a direction than in the c direction. In the observation of the 50 c/s D-E hysteresis loop, the residual polarization increased monotonously and the coercive field increased first and decreased next after passing through a peak, with decreasing ratio of the electrode area to the whole area of crystal surfaces. These peculiarities, which may together be called a “hamidashi” (bulging-out) effect, were not seen in BaTiO₃ and hence seem to be a character of ferroelectrcis such as NaNO₂ in which the polarization reversal would be realized by a rotational behavior of radicals.