Angelw: the research team of Luo Junhua of Fujian Institute of physical composition has made new progress in the research of polarized fast flipped ferroelectric crystal materials

Luo Junhua, researcher team of "inorganic optoelectronic functional crystal materials" in the State Key Laboratory of structural chemistry, Fujian Institute of architecture, Chinese Academy of Sciences An ionic ferroelectric compound was designed and synthesized under the support of NSFC excellent youth fund and Fujian Provincial Outstanding Youth Fund, which realized the rapid reversal of spontaneous polarization effect Ferroelectrics are a kind of important polar photoelectric functional materials, which have rich properties of nonlinear optics, piezoelectricity, pyroelectricity, ferroelectricity and photovoltaic In recent years, ferroelectric molecular compounds have been widely concerned, and gradually developed into a kind of important supplementary materials for traditional inorganic ferroelectric ceramics However, how to realize the fast reversal of spontaneous polarization is an important problem to be solved in the research of molecular ferroelectric materials The research team found that the N-Methylmorpholine cation and trinitrophenol anion in the compound are connected by strong N-H ·· o hydrogen bond, and the two structural elements are in order near 315 K- Furthermore, the ferroelectric phase transition process of the compound was confirmed by the second-order nonlinear optical effect, pyroelectric, hysteresis loop and variable temperature solid-state NMR In addition, the spontaneous polarization of the material is very easy to reverse under the action of external electric field, and the reversal frequency is as high as 263 kHz This work not only realizes the design and construction of ferroelectric molecular compounds, but also provides a potential for further development of the application of this kind of materials The relevant research results were recently published in angelw Chem Int ed (DOI: 10.1002 / ange 201805776) Due to the originality, novelty and importance of the work, the paper was highly praised by the reviewers and was selected as the VIP article of the magazine Researcher sun Zhihua is the first author of the paper.