抄録
The permanent dipole of the NO2 radical and the relative displacement between the ions are considered about the ferroelectricity in NaNO2. In this case the possibility of the rotation of NO2 can be explained as the mixed double rotations around the a-axis and the c-axis. The IC phase between the ferroelectric and paraelectric phases is considered to be constructed by the interaction between the 2D electron system on the c-domain surface of the crystal and the NO2 dipole, whose long periodicity can be estimated by the magnitude of spontaneous polarization.
