| Titre : | Exploration et étude des nouvelles générations des verres des oxydes lourds à base d'antimoine pour la photonique |
| Auteurs : | Nesrine Guesmia, Auteur ; Majda Hamzaoui, Directeur de thèse |
| Type de document : | Monographie imprimée |
| Editeur : | Biskra [Algérie] : Faculté des Sciences Exactes et des Sciences de la Nature et de la Vie, Université Mohamed Khider, 2022 |
| Format : | 1 vol. (151 p.) / couv. ill. en coul / 30 cm |
| Langues: | Français |
| Résumé : |
This study focuses on the synthesis of new SWN glasses designed primarily for photonic applications. Physical, thermal, mechanical, optical, and structural tests are performed on the two series (90–x) Sb2O3–10WO3–xNaPO3 and (80–x) Sb2O3–10WO3–xNaPO3. The DSC curves proved our glasses' glassy nature as well as their heat stability. Vickers hardness, modulus of elasticity, and Raman spectroscopy were all used to evaluate the materials. Enhanced stiffness and changes in the structural network of the glass system are connected to improvements in elastic moduli and physical characteristic parameters. By forming a P-O-M bridge (M=P, Sb, or W), the inclusion of NaPO3 content improves network connectivity and increases Tg and elasticity modulus. This might be due to the glass network polymerizing as a result of the high concentration of PO4, which acts as a bridge between them, as shown by Raman spectroscopy. Chemical modifications in the glass composition caused by the creation of linear phosphate chains with Sb2O3 and WO3, which improved the connectivity and stiffness of the glass network. Sm+3 ions doped SWN glasses in the chemical composition (40-x) Sb2O3- 10WO3-50NaPO3-xSm2O3 where x = 0.15, 0.3, 0.45, 0.60 and 0.75 mol% were prepared by the conventional melt-quenching-annealing technique. Emission spectra which presented a prominent transition of 4G5/2→6H5/2(561 nm),4G5/2→6H7/2(596 nm) 4G5/2→6H9/2(643 nm) and 4G5/2→6H11/2(707 nm) have been registered with excitation at 402 nm. As Sm+3 content increases, the experimental lifetime of SWNSm glasses decreases from 1.846 ms to 1.734 ms, which leads to an increase in OH groups and a probability of NR relaxations in these samples. The chromaticity coordinates (x, y) are collected in the orange region, making these Sm3+ ions doped SWN glasses suitable for orange LED and laser applications. |
| Sommaire : |
List of figures.............V List of tables...............IX General Introduction...........1 Chapter I: Generals on the glass I.1Introduction...................7 I.2 Glass definition.........8 I.3 Glass production..........8 I.4 Glass transition..........9 I.5 Glass formation....11 I.5.1 Formative elements.......12 I.5.2 Modifier elements......12 I.5.3 Intermediate elements...13 I.6 General characteristics of glass chemical compositions......14 I.6.1 Antimony oxide Sb2O3....14 I.6.2 Tungsten trioxide WO3.16 I.6.3 Phosphate...........17 I.6.3.1 Tetrahedra Q3.............18 I.6.3.2 Tetrahedra Q2.............18 I.6.3.3 Tetrahedra Q1.......19 I.6.3.4 Tetrahedra Q0..............20 I.7 Rare earth ions............20 I.7.1 Samarium ions........20 I.7.2 Effect of RE doping on the glass structure............23 I.8 Photonic applications....23 Chapter II: Experimental technique of characterization glasses II.1 Introduction......29 II.2 Characterization techniques.30 II.3 Thermal characteristics...30 II.3.1 Experimentation equipment..32 II.4 Physical and mechanical properties...4II II.4.1 Density......34 II.4.1.1 Experimentation equipment..34 II.4.2 Elastic properties...34 II.4.2.1 Experimental apparatus 36 II.4.3 Micro-hardness 37 II.4.3.1 Experimentation equipment.........38 II.5 Optical and structural characteristics38 II.5.1 UV-Vis and IR spectroscopy..38 II.5.2 Optical characteristics..40 II.5.2.1 Experimentation equipment.41 II.5.2.2 Determination of the forbidden band width (Eg) and the Urbach energy (Eu)..42 Determination of the forbidden band width.....42 Determination of the Urbach energy.....43 II.5.3 Infrared spectroscopy (FTIR).44 II.5.3.1 Experimental equipment...46 II.6 Fluorescence spectroscopy47 II.6.1 Experimental equipment..48 II.7 Raman spectroscopy..49 II.7.1 Experimental equipment.51 Chapter III: Physical properties of glasses on the ternary system Sb2O3-WO3-NaPO3 III.1 Introduction...55 III.2 Production of glass.....56 III.2.1 Choosing a crucible...56 III.2.2 Starting materials......56 III.2.3 Synthesis.....56 III.3 Vitreous domains....59 III.3.1 Binary systems....59 III.3.1.1 The (100-x) Sb2O3-xWO3 and (100-x) NaPO3- xWO3 binary systems..59 III.3.1.2 In the binary system (100-x) Sb2O3 – x NaPO3..60 III.3.2 The ternary system... 60 III.4 Physical characteristics.. 64 III.4.1 Density, molar volume, oxygen molar volume and oxygen packing density......64 III.5 Thermal properties by DSC.... 69III III.6 Elastic properties....74 III.6.1 Elastic modulus experiment...74 III.6.2 Elastic moduli and Poisson's ratio by Makishima-Mackenzie's theory..... 76 III.7 Micro- Hardness... 84 III.8 Conclusion 85 Chapter IV: Optical and structural studies of SWN glasses IV.1 Introduction....89 IV.2 Optical charactiristics....89 IV.2.1 Band gap energy and Urbach energy.89 IV.2.2 Calculation of optical properties..5 IV.3 Structural properties..102 IV.3.1 Number of network bonds ( |
| En ligne : | http://thesis.univ-biskra.dz/id/eprint/5985 |
Disponibilité (1)
| Cote | Support | Localisation | Statut |
|---|---|---|---|
| TPHY/123 | Théses de doctorat | bibliothèque sciences exactes | Consultable |
