After Effect of the Domain Motion in Rochelle Salt Crystal

After effect of the domain motion in rochelle salt crystal was observed for several hours. Quasi-static f – E hysteresis loop was obtained, where f is the fraction of the domain saturated in one direction to the total volume of the crystal. Comparing this with P – E hysteresis loop at 50 cps, differences are remarkable. A.c. hysteresis loop has shallow sloping sides and high coercivity, while quasi-static f – E hysteresis loop is almost square and shows much lower coercivity. f is time dependent and can be expressed in the formula: {aligned} f(t){=}1-e^{-{α}t} {aligned} where time constant 1/α is about one hour for critical field about 60 v/cm, in the sample of thickness 0.6 mm at 10°C.