Dielectric Properties of Ferroelectric NaNO₂

抄録

In NaNO₂ crystals, prepared by both of the fusion method and the aqueous solution method, the D-E hysteresis loops were observed by the 50 c/s ac field and the dielectric constant along the ferroelectric b axis, ε_b, was measured by the 100 kc/s ac voltage. The pyroelectric current was measured by the usual galvanometer method. The values of the spontaneous polarization determined by two methods agreed well with each other. ε_b showed a distinct anomaly around the Curie temperature and obeyed the Curie-Weiss law below and above the Curie temperature. The ratio of two Curie constants was found to be 9.6:1. Some discussions, taking account of the crystal structure, were made.