Lum, C. Y. and Lim, K-G and Chew, K-H (2022) Revisiting the Kittel's model of antiferroelectricity: Phase diagrams, hysteresis loops and electrocaloric effect. Journal of Physics: Condensed Matter, 34 (41). ISSN 0953-8984, DOI https://doi.org/10.1088/1361-648X/ac7e99.
Full text not available from this repository.Abstract
We revisit the Kittel's model of antiferroelectricity by extending the model to study the phase transitions, hysteresis loop behaviors and electrocaloric effect (ECE) of antiferroelectrics (AFEs). By considering both the first- and second-order AFEs, explicit expressions for the physical and staggered polarizations of AFEs in the stable states are derived. We also obtain the analytical solutions for describing the dielectric susceptibilities of AFEs in the AFE and paraelectric (PE) phases. Coercive fields in AFE are also derived and studied. To verify the usefulness of the Kittel's model of antiferroelectricity, we apply the model to systematically investigate the phase transitions, hysteresis loops and ECEs of PbZrO3 (PZO). By adopting appropriate values of the Kittel's parameters for first-order transition, analytical and numerical results are obtained and discussed. Our results show that PZO exhibits a complex temperature (T)-electric field (E) phase diagram, consisting of the AFE, ferroelectrics, ferrielectric, PE and mixed phases. The T-E phase diagram is qualitatively agreed with the new AFE model that was derived based on symmetry by Toledano and Khalyavin (2019 Phys. Rev. B 99 024105). We found that the calculated zero-field dielectric susceptibility is qualitatively and quantitatively agreed with experimental results. We show that the polarizations and dielectric susceptibilities of PZO in heating and cooling deviate from each other, as expected for the first-order materials. Our calculated results also reveal that the ECE in PZO has an electro-heating of Delta T approximate to +6.5 degrees C and an electro-cooling of Delta T approximate to -4.0 degrees C, respectively, which are comparable to the experimental results.
| Item Type: | Article |
|---|---|
| Funders: | MyBrain15 under Ministry of Higher Education Malaysia |
| Uncontrolled Keywords: | Revisiting Kittel's model; Lead zirconate; Electrocaloric effect; Phase diagrams; Hysteresis loops |
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 03 Nov 2023 09:51 |
| Last Modified: | 03 Nov 2023 09:51 |
| URI: | http://eprints.um.edu.my/id/eprint/41521 |
Actions (login required)
 |
View Item |
