期刊
CHEMICAL SCIENCE
卷 13, 期 17, 页码 4794-4800出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sc07045b
关键词
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资金
- National Natural Science Foundation of China [21991141]
- Open Project of Shanghai Key Laboratory of Magnetic Resonance [2018004]
Two-dimensional hybrid double perovskites have attracted a lot of attention due to their intriguing physical properties. In this study, we successfully synthesized a 2D lead-free ferroelastic material through a structurally progressive strategy. The mechanism of structural phase transition and molecular motion were fully characterized.
Two-dimensional (2D) hybrid double perovskites have attracted extensive research interest for their fascinating physical properties, such as ferroelectricity, X-ray detection, light response and so on. In addition, ferroelastics, as an important branch of ferroic materials, exhibits wide prospects in mechanical switches, shape memory and templating electronic nanostructures. Here, we designed a 2D phase-transition double perovskite ferroelastic through a structurally progressive strategy. This evolution is core to our construction process from 0D to 1D and AgBi-based 2D. In this way, we successfully synthesized 2D lead-free ferroelastic (DPA)(4)AgBiBr8 (DPA = 2,2-dimethylpropan-1-aminium) with a high Curie temperature (T-c), which shows a narrower band gap than 0D (DPA)(4)Bi2Br10 and 1D (DPA)(5)Pb2Br9. Moreover, the mechanism of structural phase transition and molecular motion are fully characterized by temperature dependent solid-state NMR and single crystal XRD. (DPA)(4)AgBiBr8 injects power into the discovery of new ferroelastics or the construction and dimensional adjustment in new hybrid double perovskites.
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