Tang Zheng, Gao Kai-Ge, Sun Xiao-Fan, Yang Xing-Ming, Wu Yi-Zhang, Gao Zhang-Ran, Cai Hong-Ling, Wu X S
Collaborative Innovation Center of Advanced Microstructures, Laboratory of Solid State Microstructures & School of Physics , Nanjing University , Nanjing 210093 , People's Republic of China.
College of Physical Science and Technology , Yangzhou University , Yangzhou 225009 , People's Republic of China.
J Phys Chem Lett. 2019 Nov 7;10(21):6650-6655. doi: 10.1021/acs.jpclett.9b02875. Epub 2019 Oct 16.
We obtained one new molecular ferroelectric material tris(2-hydroxyethyl) ammonium bromide () that crystallizes in aqueous solution at room temperature with a space group of 3 which belongs to ten polar space groups. There is a paraelectric-to-ferroelectric phase transition at 424 K (from hexagonal 3̅ to hexagonal 3 phase). Such a high transition temperature is close to that of diisopropylamine bromide (426 K) and higher than that of many other molecular ferroelectrics, such as triethylmethylammonium tetrabromoferrate(III) (360 K); some of the organic-inorganic perovskite ferroelectrics, such as (cyclohexylammonium)PbBr (363 K); and some inorganic ferroelectrics, including BaTiO (393 K). The saturated polarization and the coercive field of measured from the ferroelectric hysteresis loop are about 0.54 μC·cm and 0.62 kV/cm, respectively. Given its superior performance, including high phase transition temperature, room-temperature ferroelectricity, small coercive electric field, and adjustable ladder-shaped dielectric constant, will have many potential applications.
我们获得了一种新的分子铁电材料三（2-羟乙基）溴化铵（ ），它在室温下于水溶液中结晶，空间群为3，属于十个极性空间群之一。在424 K时存在顺电-铁电相变（从六方 到六方3相）。如此高的转变温度接近二异丙基溴化铵的转变温度（424 K），且高于许多其他分子铁电体，如三乙基甲基溴化铁（III）（360 K）；一些有机-无机钙钛矿铁电体，如（环己基铵）PbBr（363 K）；以及一些无机铁电体，包括BaTiO（393 K）。从铁电滞回环测量得到的 的饱和极化强度和矫顽场分别约为0.54 μC·cm 和0.62 kV/cm。鉴于其优异的性能，包括高相变温度、室温铁电性、小矫顽电场和可调节的梯形介电常数， 将有许多潜在应用。
