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Updated: Jun 9, 2025
From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Rational Design of Novel Polar Nonlinear Optical Materials in Alkali Metal Rare Earth Iodates
Lijuan Liu1, Haotian Tian1, Mingjun Xia1
1Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry Chinese Academy of Sciences, Beijing 100190, China.
Abstract:
Four new potassium rare earth iodates, namely, acentric K2Lu(IO3)5 and KM(IO3)4(HIO3)0.33 (M = Ce/Pr) and centric KLa(IO3)4, were successfully grown by mild hydrothermal reactions. Three of them exhibit polar structures; K2Lu(IO3)5, KCe(IO3)4(HIO3)0.33, and KPr(IO3)4(HIO3)0.33 show second-harmonic generation (SHG) responses of 3.0, 1.0, and 0.8 × KDP, respectively. These three iodates are phase-matchable for second-harmonic generation. The influence of changes in the radius and coordination mode of rare earth ions on the crystal structure and SHG response has been discussed in detail. Our findings suggest that in the alkali metal rare earth iodate, modulating the arrangement of iodate groups by changing the coordination geometry of rare earth ions is an effective strategy for designing polar NLO materials.
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