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Successive near-room-temperature dielectric phase transitions in a lead-free hybrid perovskite-like compound

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Abstract

Solid–solid phase transition materials have attracted increasing attention because of their variety of applications in optoelectronic devices, data storage, and ferroelectric field-effect transistors. Hybrid organic–inorganic perovskite materials combine the characteristics of organic and inorganic components and thus might be promising candidates to obtain phase-transition materials. Here, we report a lead-free organic–inorganic hybrid (hexamethyleneimine)2BiBr5 (1), which displays successive phase transitions at 268 K, 304 K and 311 K upon heating; these phase transitions are induced by the distorted configurational change in organic cations and slight reorientational displacement of [BiBr5]n2− polyanionic zigzag chains. In addition, the UV/Vis optical spectrum indicates that 1 has an indirect bandgap of 2.70 eV. Furthermore, computational analyses disclose that the inorganic perovskite-like building blocks of 1 contribute significantly to its semiconducting properties. This study offers a pathway to explore new lead-free organic–inorganic hybrids with phase transition.

Graphical abstract: Successive near-room-temperature dielectric phase transitions in a lead-free hybrid perovskite-like compound

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Publication details

The article was received on 11 Oct 2018, accepted on 16 Nov 2018 and first published on 19 Nov 2018


Article type: Research Article
DOI: 10.1039/C8QI01097H
Citation: Inorg. Chem. Front., 2019, Advance Article
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    Successive near-room-temperature dielectric phase transitions in a lead-free hybrid perovskite-like compound

    J. Zhang, S. Han, X. Liu, C. Ji, K. Tao, M. A. Asghar, J. Luo and Z. Sun, Inorg. Chem. Front., 2019, Advance Article , DOI: 10.1039/C8QI01097H

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