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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
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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 (0.44\pm0.03) 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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Jose-Maria Delgado-Sanchez, Jose-Maria Martin-Olalla, Maria-Carmen Gallardo, Saturio Ramos, Marceli Koralewski, Jaime del Cerro. 2005-03-30. Influence of the electric field on the latent heat of the ferroelectric phase transition in KDP. https://doi.org/10.1088/0953-8984%2F17%2F17%2F012

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