dielectric hysteresis

dielectric hysteresis

[‚dī·ə′lek·trik hi·stə′rē·səs]
(electricity)
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In ferroelectrics the dielectric losses are associated with the hysteresis in the spontaneous polarization switching in alternating electric fields (dielectric hysteresis loop), i.e.
Dielectric hysteresis loops were measured by the modified Sawyer-Tower method simultaneously with distant temperature control with the aid of thermal vision camera Testo-875-1.
The experiments show that for saturated dielectric hysteresis loops the increase of the electric field frequency results in a decrease of reversible polarization values, which obeys the exponential rule (Fig.
where E is the intensity of applied field, P is the polarization calculated by dielectric hysteresis loop data, U is the generator voltage, d is the sample thickness, Q is the charge, S is the sample area, I is the switching current passing during the cycle time t, f is the measurement frequency of the AC field, and V is the sample volume.
Dielectric hysteresis loops were measured by the Sawyer-Tower method simultaneously with distant temperature control with the aid of thermal vision camera Testo-875-1.
where E is the intensity of applied field, P is the polarization calculated by dielectric hysteresis loop data, U is the generator voltage, d is the sample thickness, Q is the charge, S is the sample area, is the switching current passing during the cycle time i, f is the measurement frequency of the AC field, and V is the sample volume.
Caption: FIGURE 1: Evolution of dielectric hysteresis loops of PZT ceramics exposed to AC sine field at the frequencies 220 (a), 600 (b), and 1500 Hz (c).