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Influence of the critical point on the electrocaloric response of relaxor ferroelectrics
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10.1063/1.3641975
/content/aip/journal/jap/110/6/10.1063/1.3641975
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/6/10.1063/1.3641975
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Typical ECE signal as a function of time, measured by a thermistor in bulk PMN-30PT ceramics (open circles). The solid blue line represents a fit to the exponential decay due to thermal losses to the bath. ΔTECE is obtained by extrapolating the fit toward the time of the rise or fall of the step-like pulse (also depicted as a rectangle in the figure). The inset shows a typical sample arrangement.

Image of FIG. 2.
FIG. 2.

(Color online) Electric field and temperature dependence of the ferroelectric order parameter P in the vicinity of the critical point for 8/65/35 PLZT bulk ceramics. Here ECP  = 18 kV/cm.

Image of FIG. 3.
FIG. 3.

(Color online) The ECE temperature change ΔT in PMN-0.30PT bulk ceramics as a function of temperature for several amplitudes of the electric-field step. Open circles denote the zero-field dielectric constant and indicate that the ECE maximum is achieved near the phase transition, which takes place on the low temperature slope of the dielectric peak (Ref. 18).

Image of FIG. 4.
FIG. 4.

(Color online) Temperature variation of the ECE temperature change ΔT in 8/65/35 PLZT bulk ceramics for different amplitudes of electric-field pulses. Open circles denote the zero-field dielectric constant measured at different frequencies. The ECE maximum is achieved near the phase transition, which takes place on the low temperature slope of the dielectric peak (Ref. 18).

Image of FIG. 5.
FIG. 5.

(Color online) Temperature dependence of the ECE ΔT in PMN bulk ceramics as a function of temperature for several amplitudes of the electric-field step.

Image of FIG. 6.
FIG. 6.

(Color online) Electric-field dependence of the ECE responsivity ΔT/E obtained in PMN, 8/65/35 PLZT, and PMN-0.30PT ceramics at a fixed temperature TCP . The solid line represents the mean-field calculation of ΔT(TCP , E)/E based on the SRBRF model (see also Fig. 7).

Image of FIG. 7.
FIG. 7.

(Color online) Electric-field and temperature dependence of the ECE responsivity ΔT/h as calculated from the SRBRF model. Here h represents a reduced electric field h = E/ECP , and t stands for the reduced temperature t = T/TCP . Note that the maximum is reached at TTCP and EECP .

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/content/aip/journal/jap/110/6/10.1063/1.3641975
2011-09-30
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Influence of the critical point on the electrocaloric response of relaxor ferroelectrics
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/6/10.1063/1.3641975
10.1063/1.3641975
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