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(NH 4 )Bi 2 (IO 3 ) 2 F 5 : An Unusual Ammonium‐Containing Metal Iodate Fluoride Showing Strong Second Harmonic Generation Response and Thermochromic Behavior
Author(s) -
Fan Huixin,
Lin Chensheng,
Chen Kaichuang,
Peng Guang,
Li Bingxuan,
Zhang Ge,
Long Xifa,
Ye Ning
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201913287
Subject(s) - iodate , thermochromism , fluoride , metal , second harmonic generation , birefringence , band gap , materials science , nonlinear optical , chemistry , ammonium , laser , crystallography , inorganic chemistry , optics , optoelectronics , iodide , nonlinear system , organic chemistry , physics , quantum mechanics
Abstract An ammonium‐containing metal iodate fluoride compound, (NH 4 )Bi 2 (IO 3 ) 2 F 5 , featuring a two‐dimensional double‐layered framework constructed by [BiO 2 F 5 ] 6− and [BiO 4 F 4 ] 9− polyhedra, as well as [IO 3 ] − groups, was successfully synthesized. The well‐ordered alignment of these SHG‐active units leads to an extraordinary strong SHG response of 9.2 times that of KDP. Moreover, this compound possesses a large birefringence (Δ n =0.0690 at 589.3 nm), a wide energy band gap ( E g =3.88 eV), and a high laser damage threshold (LDT; 40.2×AgGaS 2 ). In particular, thermochromic behavior was observed for the first time in this type of compound. Such multifunctional crystals will expand the application of nonlinear optical materials.