Mixed Bromine–Chlorine Induced Great Dielectric and Second-Order Nonlinear Optical Properties Changes in Phase Transitions Compounds [H2mdap][BiBr5(1-x)Cl5x] (x = 0.00–1.00)
作者： Ya Wang , Chao Shi , Xiang-Bin Han
关键词: Crystal structure 、 Phase transition 、 Chemistry 、 Computational chemistry 、 Halogen 、 Dielectric 、 Doping 、 Second-harmonic generation 、 Intermolecular force 、 Chemical physics 、 Cationic polymerization
摘要: Doping/mixing method plays an important role in modulating the structures and physical properties of functional materials. Herein, we report that mixed crystals [H2mdap][BiBr5(1-x)Cl5x] (H2mdap = protonated N-methyl-1,3-diaminopropane, x 0.00–1.00) undergo phase transitions with trend larger x, higher transition temperature. Variable-temperature structure analysis shows anionic cationic moieties crystal lattice contribute to transition. Room-temperature comparisons reveal point moving a temperature is mainly due decrease Bi–Cl/Br–Bi angles chains slightly alter intermolecular interactions different components halogen atoms Cl Br. Dielectric second harmonic generation experiments demonstrate their similar behaviors coexistence switchable dielectric bistable nonlinear optical effects. Mixed Br–Cl induced great dielec...
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