Successive near-room-temperature dielectric phase transitions in a lead-free hybrid perovskite-like compound. Issue 1 (7th December 2018)

• Record Type: Journal Article
• Authors: Zhang, Jing; Han, Shiguo; Liu, Xitao; Ji, Chengmin; Tao, Kewen; Asghar, Muhammad Adnan; Luo, Junhua; Sun, Zhihua
• Is Part Of: Inorganic chemistry frontiers. Volume 6:Issue 1(2019)
• Page Start: 233
• Page End: 237
• Publication Date: 2018-12-07
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8qi01097h
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : We have reported a lead-free organic–inorganic hybrid compound, (hexamethyleneimine)2 BiBr5 (1 ), which undergoes three successive phase transitions in the vicinity of room temperature. 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)2 BiBr5 (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 ] n 2− polyanionic zigzag chains. In addition, the UV/Vis optical spectrum indicates that1 has an indirect bandgap of 2.70 eV. Furthermore, computational analyses disclose that the inorganic perovskite-like building blocks of1 contribute significantly to its semiconducting properties. This study offers a pathway to explore new lead-free organic–inorganic hybrids with phase transition.