13446-76-9Relevant academic research and scientific papers
A Series of Mixed-Metal Germanium Iodates as Second-Order Nonlinear Optical Materials
Mao, Fei-Fei,Hu, Chun-Li,Chen, Jin,Mao, Jiang-Gao
, p. 2443 - 2452 (2018)
A series of new compounds in the A/Ae-Ge4+-IO3 system, namely, A2Ge(IO3)6 (A = Li, Na, Rb, or Cs) and BaGe(IO3)6(H2O), have been obtained by introducing GeO6 octahedra into a ternary metal iodate system. The structures of all five new compounds feature a zero-dimensional [Ge(IO3)6]2- anion composed of a GeO6 octahedron connecting with six IO3 groups, the alkali or alkali-earth cations acting as spacers between these anions and maintaining charge balance. Interestingly, the isomeric Li2Ge(IO3)6 and Na2Ge(IO3)6 are noncentrosymmetric (NCS), whereas the isostructural Rb2Ge(IO3)6 and Cs2Ge(IO3)6 are centrosymmetric. BaGe(IO3)6(H2O) is the first NCS alkali-earth germanium iodate reported. Powder second-harmonic generation (SHG) measurements show that Li2Ge(IO3)6, Na2Ge(IO3)6, and BaGe(IO3)6(H2O) crystals are phase-matchable and display very large SHG signals that are approximately 32, 15, and 12 times that of KH2PO4, respectively, under 1064 nm radiation and 2, 0.8, and 0.8 times that of KTiOPO4, respectively, under 2.05 mm laser radiation. The compounds show high thermal stability and a large laser damage threshold, indicating their potential applications as nonlinear optical (NLO) materials in visible and infrared spectral regions. Measurement of optical properties, thermal analysis, and theoretical calculations of the SHG origin have been performed. Our studies indicate that introducing non-second-order Jahn-Teller-distortive MO6 octahedra into metal iodate systems can also lead to good mixed-metal iodate NLO materials.
Structural modulation of molybdenyl iodate architectures by alkali metal cations in AMoO3(IO3) (A = K, RB, Cs): A facile route to new polar materials with large SHG responses
Sykora, Richard E.,Kang, Min Ok,Halasyamani, P. Shiv,Albrecht-Schmitt, Thomas E.
, p. 1951 - 1957 (2002)
Three new molybdenyl iodates, KMoO3(IO3) (1), RbMoO3(IO3) (2), and CsMoO3(IO3) (3), have been prepared through the hydrothermal reactions of MoO3 with AIO4 (A = K, Rb, or Cs) at 180°C. These compounds are isolated as nearly colorless, air-stable crystals. Single-crystal X-ray diffraction experiments reveal that 1 possesses a corrugated layered structure constructed from molybdenum oxide chains that are bridged by iodate anions. The puckering of the layers is caused by the alignment of bent molybdenyl (MoO22+) groups along one side of the molybdenum oxide chains. The K+ cations separate these layers from one another and serve to balance charge. In contrast, compounds 2 and 3, which are isostructural, form three-dimensional structures with small cavities filled with Rb+ or Cs+ cations. The differences between the structures of 1 and those of 2 and 3 are due to rotation of the molybdenyl units as translation occurs down the molybdenum oxide chains in order to accommodate the increased size of the Rb+ and Cs+ cations. This rotation allows for the iodate anions to bridge the molybdenum oxide chains in an additional dimension, creating a three-dimensional network structure. Furthermore, while 1 crystallizes in a centrosymmetric space group, 2 and 3 crystallize in polar space groups. Second-harmonic generation measurements on 2 and 3 show large responses of 400x α-quartz. Differential scanning calorimetry measurements demonstrate that 2 and 3 are thermally stable to 494 and 486°C, respectively. UV-vis diffuse reflectance spectra of these compounds show a high degree of transparency from 1 to 3 eV and a band gap of 3.1 eV.
The lone-pair cation I5+ in a hexagonal tungsten oxide-like framework: Synthesis, structure, and second-harmonic generating properties of Cs2I4O11
Ok, Kang Min,Halasyamani, P. Shiv
, p. 5489 - 5491 (2004)
The layered iodate Cs2I4O11 has been synthesized and characterized. Its hexagonal tungsten oxide-like framework consists of six-membered rings of corner-sharing IO5 polyhedra with three lone pairs pointing inward and three lone pairs pointing outward (depicted for central ring). Capping of the layer by asymmetric IO3 polyhedra on one side results in a noncentrosymmetric material with highly efficient second-harmonic generating properties.
Characterization of Molecular Alkali Metal Iodates by Mass Spectrometry and Matrix Isolation IR Spectroscopy
Biggs, Karen R.,Gomme, Robin A.,Graham, John T.,Ogden, J. Steven
, p. 9738 - 9741 (1992)
Samples of the solids MIO3 (M = Li, Na, K, Rb, Cs) have been vaporized in vacuo and the ternary products characterized by mass spectrometry, and by infrared spectroscopy in low-temperature nitrogen, oxygen and argon matrices.The molecular species KiO3, RbIO3, and CsIO3 have been identified for the first time and their IR spectra shown to be consistent with overall C3v symmetry involving tridentate coordination.This conclusion is further confirmed, in the case of CsIO3 isolated in argon, by a detailed analysis of (18)O isotope patterns.In contrast, samples of LiIO3 and NaIO3 appeared to undergo decomposition to the iodide and oxygen.
RbIO3 and RbIO2F2: Two Promising Nonlinear Optical Materials in Mid-IR Region and Influence of Partially Replacing Oxygen with Fluorine for Improving Laser Damage Threshold
Wu, Qi,Liu, Hongming,Jiang, Fangchao,Kang, Lei,Yang, Lei,Lin, Zheshuai,Hu, Zhanggui,Chen, Xingguo,Meng, Xianggao,Qin, Jingui
, p. 1413 - 1418 (2016)
Laser damage threshold (LDT) has been considered as a key index, apart from the nonlinear optical (NLO) effect, to characterize the performance of a mid-infrared NLO material. This paper reports and compares the properties of RbIO3 and RbIO2F2 as potential nonlinear optical (NLO) materials to be used in the mid-IR region. RbIO3 is a known compound, and its powder SHG (second harmonic generation) effect is carefully measured in this work for the first time to be as strong as 20 times that of KDP, and its powders show a high damage threshold (LDT) of 125 MW/cm2. In order to investigate the influence on the properties by partially replacing oxygen with fluorine atoms, the new compound RbIO2F2 is synthesized and characterized. Although it also shows relatively strong powder SHG responses 4 times that of KDP, the LDT value of the powders is improved to 156 MW/cm2. The transparent region and the thermal stability of two compounds are also measured with satisfactory results. The electronic structure and the properties of the materials are also investigated by the theoretical approach. All these indicate that RbIO3 and RbIO2F2 are both promising candidates for NLO materials to be used in the mid-IR region and that partially replacing oxygen with fluorine in the molecule can improve the laser damage threshold of the material.
A series of new alkali metal indium iodates with isolated or extended anions
Yang, Bing-Ping,Sun, Chuan-Fu,Hu, Chun-Li,Mao, Jiang-Gao
, p. 1055 - 1060 (2011)
Systematic explorations of new phases in the AI-In III-IV-O system by hydrothermal reactions led to five new compounds, namely, AIn(IO3)4 (A = Li, Na), Rb 3In(IO3)6 an
On the knowledge of oxides A[MO4]: On LiMnO4, KMnO4, RbMnO4, CsMnO4 as well as RbIO4, CsIO4. (-What does the crystal structure of . . . mean? -)
Hoppe,Fischer,Schneider
, p. 1135 - 1142 (2008/10/08)
These investigations confirm again that, sufficient purity, symmetry and lack of disorder etc. of investigated single crystals provided: the structure of a solid is characterized only if a) lattice constants are determined precisely by powder data; b) a couple of single crystals is sufficiently investigated by film data; c) the quantitative comparison of crystal structures of a chemical series like A[MnO4] with another one like A2[SO4] alone enables one to estimate the quality of different structural investigations of the same material. d) The crystal structure of a solid is still non-existent.
