(NH )Bi (IO ) F : An Unusual Ammonium-Containing Metal Iodate Fluoride Showing Strong Second Harmonic Generation Response and Thermochromic Behavior.

Author(s) Fan, H.; Lin, C.; Chen, K.; Peng, G.; Li, B.; Zhang, G.; Long, X.; Ye, N.
Journal Angew Chem Int Ed Engl
Date Published 2019 Dec 09

An ammonium-containing metal iodate fluoride compound, (NH )Bi (IO ) F , featuring a two-dimensional double-layered framework constructed by [BiO F ] and [BiO F ] polyhedra, as well as [IO ] 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 (Δn=0.0690 at 589.3 nm), a wide energy band gap (E =3.88 eV), and a high laser damage threshold (LDT; 40.2×AgGaS ). 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.

DOI 10.1002/anie.201913287
ISSN 1521-3773
Citation Angew Chem Int Ed Engl. 2019.

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