Analysis of the dielectric constant, spontaneous polarization and the coersive field close to the phase transitions in ferroelectric K2CoCl4

YURTSEVEN H. H., Doğan E.

FERROELECTRICS, vol.504, no.1, pp.15-21, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 504 Issue: 1
  • Publication Date: 2016
  • Doi Number: 10.1080/00150193.2016.1238707
  • Journal Name: FERROELECTRICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.15-21
  • Middle East Technical University Affiliated: Yes

Abstract

Temperature dependence of the dielelctric constant epsilon(a) along a axis and the spontaneous polarization P-S is analyzed near the ferroelectric transition (T-C = 182 degrees C) in K2CoCl4. The power-law formula is used for the analysis of the observed data from the literature. Critical exponents we determine from our analysis indicate that K2CoCl4 exhibits a weak first order transition. Coercive field EC is also analyzed using the experimental data which decreases smoothly as the temperature increases toward the transition temperature T-C. It is concluded that the theoretical model(s) with the non-zero applied electric field, can explain the ferroelectric properties of K2CoCl4 close to the phase transitions.