Research Interests:
Research Interests:
We propose and describe combined multipolar vibrational decompositions of IR, polarized Raman and hyper-Raman spectra as a powerful method to study and interpret vibrational spectra in isotropic materials. We have applied this new method... more
We propose and describe combined multipolar vibrational decompositions of IR, polarized Raman and hyper-Raman spectra as a powerful method to study and interpret vibrational spectra in isotropic materials. We have applied this new method to the molecular liquid ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Abstract A structural approach of glasses belonging to the B 2 O 3---SiO 2---Li 2 O system has been carried out by Raman spectroscopy. A complementary study of the boron environment by RMN was also realized. The glasses are formed by two... more
Abstract A structural approach of glasses belonging to the B 2 O 3---SiO 2---Li 2 O system has been carried out by Raman spectroscopy. A complementary study of the boron environment by RMN was also realized. The glasses are formed by two separate phases ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Les spectres Raman et Infrarouge des phosphates de cuivre de type Nasicon CuIM2(PO4)3, CuII0,5M2(PO4)3et H0,5CuI0,5M2(PO4)3(M= Ti,Zr) ont été étudiés. Une analyse de groupe facteur a permis de préciser les modes internes de l'anion... more
Les spectres Raman et Infrarouge des phosphates de cuivre de type Nasicon CuIM2(PO4)3, CuII0,5M2(PO4)3et H0,5CuI0,5M2(PO4)3(M= Ti,Zr) ont été étudiés. Une analyse de groupe facteur a permis de préciser les modes internes de l'anion PO3−4. Des diagrammes de corrélation pour différentes symétries du site de PO4dans le type structural Nasicon ont été proposés. L'évolution des spectres est corrélée avec celle de
Research Interests:
Inertial fusion targets are of two basics types: direct drive and indirect drive. The french Laser MegaJoule (LMJ) will preferentially use indirect drive experiments. However, to contribute to the determination of the best target for... more
Inertial fusion targets are of two basics types: direct drive and indirect drive. The french Laser MegaJoule (LMJ) will preferentially use indirect drive experiments. However, to contribute to the determination of the best target for inertial fusion energy, both direct and indirect drive will be considered on LMJ-facility. That is why studies on materials for use as first-wall LMJ target
Research Interests:
Germanium-based glasses containing heavy metal oxides (Sb2O3) have been investigated. These materials are good candidates for near infrared (IR) applications due to their mid-wave IR cut-off wavelengths (5 ≈ 7 mum). Among inorganic... more
Germanium-based glasses containing heavy metal oxides (Sb2O3) have been investigated. These materials are good candidates for near infrared (IR) applications due to their mid-wave IR cut-off wavelengths (5 ≈ 7 mum). Among inorganic glasses, sulfide materials exhibit the largest third-order optical nonlinear susceptibility and good IR transparency but suffer from low thermal-mechanical stability and photo-induced degradation upon exposure to near-bandgap radiation. The preparation of oxysulfide materials for optical applications offers a unique trade off between the superb chemical stability of the oxide and the attractive optical properties of sulfide. In this presentation we describe a new chemical route for the preparation of oxysulfide glasses for optical applications. The evidence of glass network structural modification is confirmed using infrared and Raman spectroscopy. Film deposition based on sputtering techniques compatible with synthesis of such materials has been performe...
Research Interests:
The single crystals of lanthanum metaphosphate MLa(PO3)4 (M=Na, Ag) have been synthesized and studied by a combination of X-ray crystal diffraction and vibrational spectroscopy. The sodium and silver compounds crystallize in the same... more
The single crystals of lanthanum metaphosphate MLa(PO3)4 (M=Na, Ag) have been synthesized and studied by a combination of X-ray crystal diffraction and vibrational spectroscopy. The sodium and silver compounds crystallize in the same monoclinic P21/n space group (C25h factor group) with the following respective unit cell dimensions: a=7.255(2), b=13.186(3), c=10.076(2)Å, β=90.40(2)°, V=963.0(4)Å3, Z=4 and a=7.300(5), b=13.211(9), c=10.079(7)Å, β=90.47(4)°, V=972.09(12)Å3, Z=4.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
A comparative study of the chemical composition and microstructure of Hi-Nicalon, Hi-Nicalon type S, Tyranno SA, Sylramic and Carborundum fibres has been conducted. This analysis has confirmed results already published but has also... more
A comparative study of the chemical composition and microstructure of Hi-Nicalon, Hi-Nicalon type S, Tyranno SA, Sylramic and Carborundum fibres has been conducted. This analysis has confirmed results already published but has also evidenced some original features. The Hi-Nicalon type S fibre has a near stoichiometric composition but it still contains some oxygen (˜1 at. %) and free carbon (˜2