Key Engineering Materials Vol. 822

Abstract: In this work, we report the role of structure on electrochromic behavior of nickel oxide thin coatings deposited via chemical vapor deposition on ITO-coated glass in (EtCp)₂Ni–O₂–Ar and (EtCp)₂Ni–O₃–O₂–Ar reaction systems. The structure and chemical composition were analyzed and then correlated with electrochemical response and transmittance modulation when immersed in 1 M KOH electrolyte. The NiO exhibits an anodic coloration, reaching an optical density modulation of 0.66 between colored and bleached state at 550 nm, with a color efficiency of 30.7 cm²C^-1. Very fast switching between states was obtained, the coloration and bleaching time did not exceed 0.05 sec.

Abstract: Lithium-oxygen thin films were deposited by atomic layer deposition (ALD) on the surface of silicon and stainless-steel using lithium bis (trimethylsilyl) amide (LiHMDS) and different counter-reagents (water, ozone, oxygen plasma). The deposited films were non-stable at storage in the air atmosphere. Results of scanning electron microscopy showed that films show a tendency to crystallization and peeling from the substrate surface. X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectroscopy revealed that films mainly consist of LiOH/Li₂CO₃. Coating the surface of lithium-oxygen films with an aluminum oxide layer using the ALD trimethylaluminum (TMA) and water as precursors did not lead to a significant improvement in stability. Nevertheless, the stable films can be obtained using ALD supercycles consisting of sequential pulsing of LiHMDS-water-TMA-water at 250°C.

Abstract: In this work, the fulfillment of Vegard's law in thin polycrystalline films Sm_1-xGd_xS and Sm_1-xEu_xS, obtained by the method of explosive evaporation of the powder in vacuum, is investigated. It is shown that compliance with the Vegard law in the manufacture of thin-film structures based on Sm_1-xEu_xS solid solutions is possible only with the same technological parameters of film deposition, in particular, the substrate temperature. In the case of the Sm_1-xGd_xS solid solutions, the law is observed only in the metal phase of the solid solutions, with x> 0.12.

Abstract: Present paper is about experimental investigation coating quality obtained by plasma transferred arc (PTA) welding in relation to the material-and process parameters. The aim of work is to get different materials coatings with satisfactory properties, which could be used at hybrid bevel gears further. The main idea of this method is to create bi-metal workpieces by deposition one material over other, then form it by thermo-mechanical processing. Using hybrid bevel gears would reduce costs because the gear would not be made of one expensive material, but has only a functional surface layer with cheap core. In is investigation steel cylinders made of C22 are coated with the higher-quality heat-treatable different steels: 41Cr4, 50CrV4 and 100Cr6 using PTA welding. Coating quality is depend on many deposition parameters, such a feederate, current, preheating temperature etc.

Abstract: The study of glass components influence on the physical and chemical properties of As–S–Se–I glasses has the potential to help design glasses with the required properties. A change of certain glass properties upon the introduction of selenium into AsSI glass was demonstrated. Non-stoichiometric compounds along the As₂S₃-AsI₃-Se diagram section were investigated by differential thermal analysis, ultrasonic measurements, dilatometric measurements. It has been shown that the introduction of selenium decreases the glass solubility in water. Change in the glass properties with the change in the short-range structure studied by Raman spectroscopy was shown. These glasses can be used for creation of immersion lenses and optical adhesives which change radiation characteristics of mid-IR LEDs.

Abstract: Ionic Seebeck effect has been investigated in Li (Na,K)₂O‐Nb₂O₅‐P₂O₅ glasses. Ionic Seebeck coefficients and heats of ion transfer have been measured. Soret coefficients have been calculated for glasses being studied. Temperature dependence and content of Nb₂O₅ dependence of Soret coefficients have been analyzed. Hypotheses of coefficients of self-diffusion and thermodiffusion ratio when temperature and content of Nb₂O₅ change have been proposed.

Abstract: This paper presents data on the mixed alkali effect in two fundamentally different systems: chalcogenide and oxide (phosphate). In the first system (Ag – Cu)_0.44AsSe_1.5, the predominantly ionic conductivity of silver-containing glasses is replaced by purely electronic in copper-containing, in the second - 0.5(Li₂O-Na₂O) – 0.4P₂O₅ – 0.1Nb₂O₅ carriers of electric current are alkaline ions and the extreme dependences of the electrical parameters associated with their joint migration.

Abstract: Theoretical and practical results on the preparation and investigation of low-melting glasses using the example of glassy chalcogenide glasses of the Ge-S-Br, Ge-Se-Br systems are presented and summarized. On the basis of fundamental properties of matter, correlations were identified with uniform positions. The glass formation regularities in the indicated chalcogenide and oxyhalide systems were determined. Areas and compositions of low-melting chalcogenide and oxyhalide glasses were considered. Approaches to obtaining of thermostable and difficult to crystallize low-melting glasses were found. Areas of their practical application were identified. On the basis of the obtained data, approaches and criteria for obtaining compositions of low-melting chalcogenide and oxide glasses with practically useful properties are formulated.

Abstract: To obtain the near infrared luminescence Bi-activated phosphate-aluminum-natrium glasses were synthesized and treated under reduction conditions. The reduction conditions were achieved by different methods: treatment in graphite atmosphere, hydrogen atmosphere, and X-ray irradiation. The spectral-luminescent properties of glass samples were measured and analyzed. Bi-activated phosphate-aluminum-natrium glasses after reduction treatment have shown wide near infrared luminescence with two peaks at the telecommunication windows region. The nature of the luminescent centers in Bi-activated phosphate-aluminum-natrium glasses are discussed. The spectral-luminescent properties of synthesized glasses were studied at the context of Bi-activated glass as the active media for tunable near infrared lasers operating in 1050-1500 nm region. The demonstrated properties of Bi-activated phosphate-aluminum-natrium glass are promising to fill the gap in near infrared lasers operating range.

Abstract: This paper describes a method for detecting defects inside high-refractive index gems. This method consists in immersion of a precious stone inside low-melting chalcogenide glass. After cooling, molten glass turns into a solid phase and is an optical cube. This cube can be photographed in layers and using OctoNus equimpment a 3D model of gemstone defects can be built. The proposed method allows you to effectively and accurately determine the coordinates of the defects in diamond and to offer the most profitable option for polishing a precious stone.