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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Minussi, F. B. [1] ; Reis, S. P. [2, 1] ; Araujo, E. B. [1]
Total Authors: 3
Affiliation:
[1] Sao Paulo State Univ, Dept Phys & Chem, BR-15385000 Ilha Solteira - Brazil
[2] Fed Inst Educ Sci & Technol Sao Paulo, BR-15503110 Votuporanga - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ACTA MATERIALIA; v. 219, OCT 15 2021.
Web of Science Citations: 0
Abstract

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 (T-f similar to 270 K) and a diffuse phase transition at high temperatures (gamma similar to 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). (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 17/13769-1 - Multiferroic and ferroelectric materials for energy converters: synthesis, properties, phenomenology and applications
Grantee:José Antonio Eiras
Support Opportunities: Research Projects - Thematic Grants