Influence of the electric field on the latent heat of the ferroelectric phase transition in KDP
Jose-Maria Delgado-Sanchez, Jose-Maria Martin-Olalla, Maria-Carmen Gallardo, Saturio Ramos, Marceli Koralewski, Jaime del Cerro
Abstract
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 (0.440.03) 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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