Huang Y, Yang J, Li ZJ, Qian K, Sao F. High-temperature ferroelastic phase transition in a perovskite-like complex: [Et4N]2[PbBr3]2.
RSC Adv 2019;
9:10364-10370. [PMID:
35520924 PMCID:
PMC9062389 DOI:
10.1039/c9ra00804g]
[Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 03/26/2019] [Indexed: 11/21/2022] Open
Abstract
A new lead-bromide hybrid organic–inorganic complex [Et4N]2[PbBr3]2 (Et = ethyl) was synthesized, and its crystal structures could be described as a distorted perovskite-like one (at room temperature phase and at high temperature phase) and a step-like dielectric anomaly was obtained at around 375 K upon heating and 367 K upon cooling. It underwent a reversible structural phase transition with the Aizu notation of 6/mmmF2/m belonging to one of the 94 species of ferroelastic phase transitions, displayed switchable dielectric behaviors triggered by the motion or reorientation of the tetraethylammonium cations and the displacement of Pb2+ and Br− ions in a solid-state crystal. Ferroelastic domain walls were also observed in atomic-force microscopy. Differential scanning calorimetry, dielectric measurements and variable-temperature X-ray structure determinations indicated this complex exhibited a dielectric anomaly associated with the structural phase transition. All of these demonstrate its potential application as a temperature switchable molecular dielectric material in the ferroic-related field.
A new lead-bromide hybrid organic–inorganic complex [Et4N]2[PbBr3]2 (Et = ethyl) was synthesized, and its crystal structures could be described as a distorted perovskite-like one and a step-like dielectric anomaly was obtained at around 375/367 K.![]()
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