Xu Yan, Xu Ke, He Lei, Yin Ti-Jian, Mu Jie, Men Jin-Tao, Zhang Wen, Ye Qiong
Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing211189, People's Republic of China.
Inorg Chem. 2023 Jan 23;62(3):1279-1285. doi: 10.1021/acs.inorgchem.2c04163. Epub 2023 Jan 7.
Ferroelastic materials have received special attention because of their great promise for mechanical switches, piezoelectric sensors, and data storage applications. Here, we report a novel ferroelastic semiconducting hybrid organic-inorganic perovskite (CHNS)PbBr () [(CHNS) is 2-amino-2-thiazolinium] with a ferroelastic phase transition at 395 K and an optical band gap of 3.43 eV. has a one-dimensional BaNiO-type structure and undergoes a high-temperature ferroelastic phase transition with an Aizu notation of 2/. Meanwhile, exhibits dielectric switch near the phase transition temperature. By introducing the thioether group, the motion of the molecules or ions of is hindered after the sorption of Pd(II) metal ions, which leads to the disappearance of the high-temperature ferroelastic phase transition and dielectric switch. This is the first reported ferroelastic semiconductor material with Pd(II) adsorption property, by studying the influence of Pd(II) adsorption on high-temperature ferroelastic phase transition, it may be enlightening to further uncover the mechanism of phase transition or the origin of ferroelasticity, which represents an important step toward multifunctional applications of lead-hybrid perovskite-based ferroelastic materials.
铁弹性材料因其在机械开关、压电传感器和数据存储应用方面的巨大潜力而受到特别关注。在此，我们报道了一种新型的铁弹性半导体有机-无机杂化钙钛矿(CHNS)PbBr（(CHNS)为2-氨基-2-噻唑啉鎓），其在395 K时发生铁弹性相变，光学带隙为3.43 eV。具有一维BaNiO型结构，并经历高温铁弹性相变，其爱知符号为2/。同时，在相变温度附近表现出介电开关特性。通过引入硫醚基团，吸附Pd(II)金属离子后，分子或离子的运动受到阻碍，导致高温铁弹性相变和介电开关消失。这是首次报道的具有Pd(II)吸附特性的铁弹性半导体材料，通过研究Pd(II)吸附对高温铁弹性相变的影响，可能有助于进一步揭示相变机制或铁弹性的起源，这是迈向基于铅杂化钙钛矿的铁弹性材料多功能应用的重要一步。
