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Bent HgI2 Molecules in the Melt and Sulfide Glasses: Implications for Nonlinear Optics

Journal Article · · Chemistry of Materials
 [1];  [1];  [2];  [1];  [3];  [1];  [1];  [4];  [5];  [6];  [7];  [1]
  1. Univ. of the Littoral Opal Coast (ULCO), Dunkerque (France)
  2. St. Petersburg State Univ. (Russia)
  3. Univ. of Rennes (France)
  4. National Inst. for Materials Science (NIMS), Tsukuba (Japan)
  5. Yamagata Univ. (Japan)
  6. Rutherford Appleton Lab. (United Kingdom)
  7. Argonne National Lab. (ANL), Argonne, IL (United States)
Nonlinear optical (NLO) crystals are widely used in advanced photonic technologies for second harmonic and difference frequency generation (SHG and DFG, respectively), producing coherent light at frequencies where existing lasers are unavailable. Isotropic glasses do not exhibit SHG or DFG, except temporarily induced anisotropy under external stimuli. Nevertheless, recent reports on glasses with chiral structural motifs show promising permanent NLO properties. We introduce an alternative solution: hybrid molecular/network glasses with noncentrosymmetric HgI2 monomers. Mercury (II) iodide consists of linear HgI2 triatomic molecules in the vapor phase and in the yellow orthorhombic polymorph stable above 400 K. At lower temperatures, the tetragonal red form is composed of corner-sharing HgI4/2 tetrahedra forming a layered extended framework. There is a gap in the molecular evolution; direct structural measurements of the liquid HgI2 phase are missing. Using high-energy X-ray scattering, pulsed neutron diffraction, and Raman spectroscopy supported by structural and vibrational modeling, we show that the mercury(II) iodide melt and HgI2-containing sulfide glasses are built up by bent HgI2 monomers (the bond angle
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Agence Nationale de la recherche (ANR); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1572410
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 11 Vol. 31; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Intrinsic second‐order nonlinearity in chalcogenide glasses containing HgI 2 journal January 2020

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