Effet des oxydes alcalino-terreux et les métaux de transitions sur les propriétés physiques des verres d oxydes basés sur Sb O

Des études récentes sont faites sur les verres d oxydes à base d antimoine et notre but est d étudier l effet des oxydes alcalino-terreux et les métaux de transition sur les propriétés physiques des verres à base Sb O . En premier lieu, les domaines de composition vitreuse ont été établis pour divers systèmes binaires ainsi que pour les systèmes ternaires Sb O -BaO-MO (M= Zn, Cd, Mn) et Sb O -PbO- M O (M = Zn, Mn, Cd, Ba). Le caractère vitreux des échantillons a été confirmé par l observation microscopique, et l analyse calorimétrique mettant en évidence le phénomène de transition vitreuse. Les températures caractéristiques ont été mesurées pour un très grand nombre d échantillons. Elles concernent, outre la transition vitreuse, le début de cristallisation, et la cristallisation et ainsi formées. L évolution de ces températures avec la composition a été menée suivant des lignes sélectionnées dans le diagramme ternaire. Par ailleurs, les facteurs de stabilité calculés à partir ces températures ont permis de définir les compositions les plus stables vis-à-vis de la dévitrification. Ensuite l étude se concentre sur l étude des propriétés physiques et optiques de verres appartenant au système ternaire Sb2O3-PbO-MnO en définissant deux lois de composition de formule générale: (80-x)Sb O -20PbO-x MnO et (70-x)Sb2O3-(30-x)PbO-2xMnO. Cette étude a permis de déterminer l influence de la teneur en manganèse sur la température de transition vitreuse, le coefficient de dilatation thermique, la microdureté Vickers et le module d Young, l indice de réfraction. Cette évolution est expliquée par l accroissement de l énergie de cohésion du verre, elle -même liait aux valeurs respectives des énergies de liaison chimiques.Recent studies are made on the oxide glasses based on antimony and our aim is to study the effect of alkaline earth oxides and transition metals on the physical properties of glasses bases Sb O . First, the glass composition ranges were established for various binary system and for ternary systems Sb O - BaO-MO (M = Zn, Cd, Mn) and Sb O PbO-M O (M = Zn, Mn, Cd, Ba). The glassy nature of the samples was confirmed by microscopic observation and calorimetric analysis highlighting the phenomenon of glass transition. The characteristic temperatures were measured for a large number of samples. These include, besides the glass transition, the beginning of crystallization, and crystallization and thus formed. The evolution of these temperatures with composition was conducted along lines selected in the ternary diagram. Moreover, the stability factors calculated from these temperatures have helped to define the compositions of the most stable vis-à-vis the devitrification. Then the study focuses on the study of physical and optical properties of glasses belonging to the ternary system Sb O -PbO-MnO by defining two composition laws of general formula (80-x)-Sb O -20PbO-x MnO and (70 -x) Sb O -(30-x) PbO-2xMno. This study determined the influence of manganese content on the glass transition temperature, the thermal expansion coefficient, Vickers micro hardness and Young's modulus, the refractive index. This evolution is explained by the increase in the cohesive energy of the glass, itself linked to the respective values of chemical binding energies.RENNES1-BU Sciences Philo (352382102) / SudocSudocFranceF

The synthesis and characterization of sprayed ZnO thin films: As a function of solution molarity

International audienceIn the present paper, the structural, electrical and optical properties of zinc oxide thin films were studied as a function of solution molarity. The ZnO thin films were deposited on glass substrates via the ultrasonic spray technique at 350°C. Polycrystalline films with a hexagonal wurtzite structure with (100) and (002) preferential orientation corresponding to ZnO films were observed. The optimal values of the crystallite size of the ZnO films were observed with (002) plan in 0.4 and 0.5 mol/l of solution molarity. All films exhibit an average optical transparency about 85% , in the visible region. The shift of optical transmittance towards smaller wavelength can be showed by the decrease of band gap caused by the change of crystallite size in polycrystalline. The maximum electrical conductivity of ZnO films was found of 2.29 (Ω.cm)–1 with 0.075 mol/l of solution molarity

Abstracts of 1st International Conference on Computational & Applied Physics

This book contains the abstracts of the papers presented at the International Conference on Computational & Applied Physics (ICCAP’2021) Organized by the Surfaces, Interfaces and Thin Films Laboratory (LASICOM), Department of Physics, Faculty of Science, University Saad Dahleb Blida 1, Algeria, held on 26–28 September 2021. The Conference had a variety of Plenary Lectures, Oral sessions, and E-Poster Presentations. Conference Title: 1st International Conference on Computational & Applied PhysicsConference Acronym: ICCAP’2021Conference Date: 26–28 September 2021Conference Location: Online (Virtual Conference)Conference Organizer: Surfaces, Interfaces, and Thin Films Laboratory (LASICOM), Department of Physics, Faculty of Science, University Saad Dahleb Blida 1, Algeria