Ferrielectricity of Monoclinic RbD₂PO₄

Abstract

The pyroelectric charge of monoclinic RbD₂PO₄ along the b axis was measured through the lower transition temperature at 44°C (T_II) and the D-E hysteresis curves were examined below T_II. The D-E triple hysteresis loops were observed below T_II, corresponding to the development of a small pyroelectric charge below T_II.
It is clarified that the crystal is ferrielectric below T_II with a small net polarization, 0.02 μC/cm², compared with the spontaneous polarization of the sublattice, 1.8 μC/cm², at 30°C.