The first mixed alkali-metal gallium iodate-fluoride,namely,LiGaF2(IO3)2,was successfully obtained under hydrothermal conditions.The structure of LiGaF2(IO3)2 features a novel two-dimensional(2D)[GaF2(IO3)2]layer comp...The first mixed alkali-metal gallium iodate-fluoride,namely,LiGaF2(IO3)2,was successfully obtained under hydrothermal conditions.The structure of LiGaF2(IO3)2 features a novel two-dimensional(2D)[GaF2(IO3)2]layer composed of[Ga2F4(IO3)6]4 dimers further bridged by(IO3)groups.LiGaF2(IO3)2 exhibits a wide band gap of 4.33 eV,corresponding to the ultraviolet(UV)absorption edge of 230 nm.Calculations of linear optical property revealed that LiGaF2(IO3)2 has a remarkably large birefringence of 0.181@1064 nm and 0.206@532 nm,indicating that it is a potential birefringent material that could be used from visible to UV region.This study provides a new method for the future discovery of promising optical crystals.展开更多
Metal iodates containing I(Ⅴ)with lone electron pairs in an asymmetric coordination geometry exhibit excellent second-harmonic generation(SHG)responses,wide transmission range and large band gaps.During the past ten ...Metal iodates containing I(Ⅴ)with lone electron pairs in an asymmetric coordination geometry exhibit excellent second-harmonic generation(SHG)responses,wide transmission range and large band gaps.During the past ten years,metal iodates have been widely studied,and introducing large electronegative fluorine atoms into metal iodates has also attracted much attention.These F-containing iodates are different from pure iodates in terms of composition,symmetry and transmittance.Especially because oxide-fluoride heterolepic anion groups can exhibit interesting structure-directing properties,e.g.trans-and cis-directing properties,these F-containing iodates also have better structure designability.Therefore,in this review,we will review the research progress of F-containing iodates and address the effect of structure-directing properties of oxide-fluoride anions on the crystal structures of F-containing iodates.Since the valence of the central cations will greatly affect the distortions and configurations of the oxide-fluoride anion groups,these F-containing iodates will be classified and introduced according to the different valences of the central cations.展开更多
基金the National Natural Science Foundation of China(21875248,21921001,and 21975256)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB20000000)the 100 Talents Project of Fujian Province。
文摘The first mixed alkali-metal gallium iodate-fluoride,namely,LiGaF2(IO3)2,was successfully obtained under hydrothermal conditions.The structure of LiGaF2(IO3)2 features a novel two-dimensional(2D)[GaF2(IO3)2]layer composed of[Ga2F4(IO3)6]4 dimers further bridged by(IO3)groups.LiGaF2(IO3)2 exhibits a wide band gap of 4.33 eV,corresponding to the ultraviolet(UV)absorption edge of 230 nm.Calculations of linear optical property revealed that LiGaF2(IO3)2 has a remarkably large birefringence of 0.181@1064 nm and 0.206@532 nm,indicating that it is a potential birefringent material that could be used from visible to UV region.This study provides a new method for the future discovery of promising optical crystals.
基金supported by the National Natural Science Foundation of China,China(Grant Nos.22071179,51902224,51972230,52172006,51890864,51890865)Natural Science Foundation of Tianjin,China(Grant Nos.20JCJQJC00060,21JCJQJC00090).
文摘Metal iodates containing I(Ⅴ)with lone electron pairs in an asymmetric coordination geometry exhibit excellent second-harmonic generation(SHG)responses,wide transmission range and large band gaps.During the past ten years,metal iodates have been widely studied,and introducing large electronegative fluorine atoms into metal iodates has also attracted much attention.These F-containing iodates are different from pure iodates in terms of composition,symmetry and transmittance.Especially because oxide-fluoride heterolepic anion groups can exhibit interesting structure-directing properties,e.g.trans-and cis-directing properties,these F-containing iodates also have better structure designability.Therefore,in this review,we will review the research progress of F-containing iodates and address the effect of structure-directing properties of oxide-fluoride anions on the crystal structures of F-containing iodates.Since the valence of the central cations will greatly affect the distortions and configurations of the oxide-fluoride anion groups,these F-containing iodates will be classified and introduced according to the different valences of the central cations.
