Dielectric Behavior of KNO₃ in Its Ferroelectric Phase III

Abstract

The dielectric behavior of KNO₃ crystal was investigated. Mainly in its ferroelectric phase III, which appears in the temperature range of about 125∼115°C on cooling, the D-E hysteresis loop along the c axis was observed by the usual Sawyer-Tower method using the 50 c/s ac electric field, the pyroelectric current in this direction was measured by the usual galvanometer method and the dielectric constants along the three crystal axes were measured by a C-meter using the 100 kc/s ac voltage. From the obtained results, the ferroelectricity in the phase III was discussed in relation with the motion of NO₃ groups.