ALL libraries (COBIB.SI union bibliographic/catalogue database)
  • Inverse electrocaloric effect in ferroelectrics and antiferroelectrics [Elektronski vir] : a phenomenological approach
    Novak, Nikola ...
    The inverse electrocaloric effect observed in ferroelectric materials is an intriguing phenomenon due to the counterintuitive relation between the dipolar entropy and the applied electric field. We ... hereby apply a Landau phenomenological approach to calculate the polarization, the dipolar entropy, and the free energy under the applied electric field, aiming for a deeper understanding of the origin of the inverse electrocaloric effect in ferroelectric and antiferroelectric materials. We demonstrate that the antiparallel orientation of the polarization with respect to the applied electric field leads to a flattening of the free energy density minima and concomitantly a less resistive polar state against the perturbation. Consequently, the dipolar entropy increases, which in turn causes an inverse electrocaloric effect in ferroelectrics. The same mechanism has been demonstrated for the antiparallel sublattice of antiferroelectrics. Furthermore, it is shown that the flattening of free energy density causes a larger increase of the dipolar entropy in an antiparallel sublattice compared to a parallel one. Hence, antiferroelectrics exhibit an inverse electrocaloric effect.
    Source: Physica. B, Condensed matter. - ISSN 1873-2135 (Vol. 651, 15. Feb. 2023, str. 1-8)
    Type of material - e-article ; adult, serious
    Publish date - 2023
    Language - english
    COBISS.SI-ID - 136623619
    DOI

Shelf entry