Influence of the electric field on the latent heat of the ferroelectric phase transition in KDP
Delgado-Sanchez, Jose-Maria · Martin-Olalla, Jose-Maria · Gallardo, Maria-Carmen · Ramos, Saturio · Koralewski, Marceli · del Cerro, Jaime
Original · EN
The specific heat, heat flux (DTA trace) and dielectric constant of KDP ferroelectric crystal have been measured simultaneously for various electric fields with a conduction calorimeter. The specific heat presents a strong anomaly but these simultaneous measurements allow us to evaluate the latent heat accurately. Latent heat decreases with field and the value of critical electric field --that where latent heat disappears-- is estimated to be (0.44±0.03) kV/cm. Incidentally, we have measured simultaneously the dielectric permittivity which suggests that latent heat is developed as domains are growing.
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