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SYNTHESES ET ÉTUDES STRUCTURALES DE COMPLEXES À OXO-ANION DE L'IODE (V) : VERS DE NOUVEAUX MATERIAUX POUR L'OPTIQUE NON LINEAIRE QUADRATIQUE

Abstract : The thesis focused on the synthesis of metallic iodates, materials for quadratic NLO, in order to develop optical devices with a broad band of transparency from visible to far infrared, covering the II and III transparency windows of the atmosphere. The discovery of NaI3O8, possessing the main feature of iodates, has opened the way for research and characterization of new phases containing the new oxo-anion [I3O8]- of iodine(V). DFT calculations were performed to describe the I-O bonds in the Rb2(IO3)(I3O8)(HIO3)2(H2O) compound. Furthermore, the crystal growth of millimeter size NaI3O8 crystals was performed by slow lowering of temperature and by solution circulation method to determine NLO properties on single crystals. Other phases containing the [IO3]- anion were obtained by synthesis in concentrated nitric acid solution, by hydrothermal or by solid state route under high pressure. The first characterizations of TiO(IO3)2 show a potentially interesting material for the NLO. The alternation of long and short bond lengths, similar to that observed in KTP, suggests significant charge transfer along the chains ***O-Ti-O***. Solid solutions beta -La1-XLnX(IO3)3 present a reversible structural transition in yama -La1-XLnX(IO3)3. The transition temperature for acentric phase with nonlinear properties varies according to the size and percentage of doping ions. Photoluminescence studies of some matrixes doped with Nd3+ and Yb3+ were performed.
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Theses
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https://tel.archives-ouvertes.fr/tel-00597748
Contributor : Yan Suffren <>
Submitted on : Wednesday, June 1, 2011 - 6:16:37 PM
Last modification on : Thursday, November 19, 2020 - 1:01:03 PM
Long-term archiving on: : Friday, September 2, 2011 - 2:27:13 AM

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  • HAL Id : tel-00597748, version 1

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Yan Suffren. SYNTHESES ET ÉTUDES STRUCTURALES DE COMPLEXES À OXO-ANION DE L'IODE (V) : VERS DE NOUVEAUX MATERIAUX POUR L'OPTIQUE NON LINEAIRE QUADRATIQUE. Matériaux. Université de Grenoble, 2010. Français. ⟨tel-00597748⟩

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