Effects of frequency, temperature, and dc bias electric field on the dielectric properties of methylammonium lead iodide from the perspective of a relaxor-like ferroelectric
| Autor: | F. B. Minussi, E. B. Araujo, S. P. Reis |
|---|---|
| Přispěvatelé: | Universidade Estadual Paulista (UNESP), Science and Technology of São Paulo |
| Rok vydání: | 2021 |
| Předmět: |
Relaxor
Phase transition Halide perovskite Materials science Ferroelectricity Polymers and Plastics Condensed matter physics Metals and Alloys Dielectric Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Dipole Dielectric properties Electric field Dispersion (optics) Ceramics and Composites Grain boundary DC bias |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2021.117235 |
| Popis: | Made available in DSpace on 2022-04-28T19:43:37Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-10-15 This work reports dielectric properties of methylammonium lead iodide as a function of frequency, temperature, and dc bias electric field studied in terms of grain and grain boundary contributions. These results were analyzed from the perspective of a relaxor-like ferroelectric nature. The temperature dependence of dielectric permittivity at different frequencies showed a wide dispersion in the vicinity of the tetragonal-cubic phase transition, suggesting a relaxor ferroelectric feature after excluding artifacts as Maxwell-Wagner effects and dc contributions. The results from plots of the Vogel-Fulcher and the modified Curie-Weiss laws indicate the existence of a freezing temperature of the dipoles responsible for the relaxor character of the material (Tf ∼ 270 K) and a diffuse phase transition at high temperatures (γ ∼ 1.52-1.74). Measurements on heating and cooling protocols under a dc bias electric field suggest field-induced polarized domains like relaxor ferroelectric. The observed signatures of transitions between non-ergodic and ergodic relaxors to ferroelectric states were attributed to polar nano regions dynamics, suggesting a critical electric field around 0.03 kV cm−1. Department of Physics and Chemistry São Paulo State University Federal Institute of Education Science and Technology of São Paulo Department of Physics and Chemistry São Paulo State University |
| Databáze: | OpenAIRE |
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