(NH4 )Bi2 (IO3 )2 F5 : An Unusual Ammonium-Containing Metal Iodate Fluoride Showing Strong Second Harmonic Generation Response and Thermochromic Behavior

Huixin Fan; Chensheng Lin; Kaichuang Chen; Guang Peng; Bingxuan Li; Ge Zhang; Xifa Long; Ning Ye

doi:10.1002/anie.201913287

(NH₄ )Bi₂ (IO₃ )₂ F₅ : An Unusual Ammonium-Containing Metal Iodate Fluoride Showing Strong Second Harmonic Generation Response and Thermochromic Behavior

Angew Chem Int Ed Engl. 2020 Mar 23;59(13):5268-5272. doi: 10.1002/anie.201913287. Epub 2020 Jan 9.

Authors

Huixin Fan^{1

2}, Chensheng Lin¹, Kaichuang Chen^{1

3}, Guang Peng¹, Bingxuan Li^{1

2}, Ge Zhang¹, Xifa Long¹, Ning Ye¹

Affiliations

¹ Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
² University of the Chinese Academy of Sciences, Beijing, 100049, China.
³ College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, Fujian, 350007, P. R. China.

PMID: 31814234
DOI: 10.1002/anie.201913287

Abstract

An ammonium-containing metal iodate fluoride compound, (NH₄ )Bi₂ (IO₃ )₂ F₅ , featuring a two-dimensional double-layered framework constructed by [BiO₂ F₅ ]^6- and [BiO₄ F₄ ]^9- polyhedra, as well as [IO₃ ]^- 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_g =3.88 eV), and a high laser damage threshold (LDT; 40.2×AgGaS₂ ). 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.

Keywords: bismuth; metal iodate fluorides; nonlinear optics; second harmonic generation; thermochromism.

Abstract

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