Abstract
The behavior of an incompletely ordered lead scandium tantalate ferroelectric (the degree of ordering s=0.8) in the region of the spontaneous ferroelectric transition is studied in ac electric fields by dielectric and optical methods. Dielectric nonlinearity of two types is observed. In fields above 2 kV/cm, the nonlinearity is caused by induced polarization effects and macrohysteresis behavior, whereas in weak fields, it is most probably associated with the dynamics of domain walls and/or phase boundaries.
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