Amorphous Selenium Kinetics

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Crystallization kinetics of amorphous Se | SpringerLink

20.01.2013· Differential scanning calorimetry was used to study crystallization behavior in selenium glass under non-isothermal conditions. The crystallization kinetics were described in terms of the Johnson–Mehl–Avrami nucleation-growth model; activation energies and kinetic parameter m JMA were determined. The study was performed in dependence with particle size, so that a novel approach toKinetic Processes in Amorphous Materials Revealed by,,In case of amorphous selenium, the position of T e appears to be driven more by viscous flow (in combination with surface tension) at low temperatures. Thus, the activation energy determined from the TMA measurements at low q + gets closer to E η. There are of course many consequences associated with the temperature variation of crystallization activation energies. In the last part of the,Kinetic Processes in Amorphous Materials Revealed by,,26.07.2019· Kinetic Processes in Amorphous Materials Revealed by Thermal Analysis: Application to Glassy Selenium. Jiří Málek Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 95, 53210 Pardubice, Czech Republic.

Crystallization of amorphous selenium films. I. Morphology,

We report a study of the morphology and kinetics of crystallization of films of a ‐Se vapor deposited on mica substrates. Morphological examination was facilitated by the complete dissolution of the amorphous component of the films by CS 2, while the crystalline component was left essentially intact.Kinetic Processes in Amorphous Materials Revealed by,,Kinetic Processes in Amorphous Materials Revealed by Thermal Analysis: Application to Glassy Selenium Jirˇí Málek * and Roman Svoboda Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 95, 53210 Pardubice, Czech Republic * Correspondence: [email protected]; Tel.: +420-466-036-553 Academic Editor: Sergey VyazovkinNonisothermal crystallisation kinetics of amorphous,,15.05.2012· Selenium and its compounds continue to be a subject of great interest. In this study, the crystallisation kinetics of a Se chalcogenide glass produced by high-energy ball milling were studied using isoconversion methods, and the results were compared with those obtained using the melt-quenching and thermal evaporation thin-film techniques [6] , [7] .

Electrochemistry of Selenium with Sodium and Lithium,

27.09.2016· Herein, we have investigated the mechanism and kinetics of both sodiation and lithiation reactions with selenium nanotubes, using in situ transmission electron microscopy. Sodiation of a selenium nanotube exhibits a three-step reaction mechanism: (1) the selenium single crystal transforms into an amorphous phase Na0.5Se; (2) the Na0.5Se amorphous phase crystallizes to form aPolyamorphism of vapor-deposited amorphous selenium in,,29.09.2020· Amorphous selenium (a-Se) has a complicated molecular structure with overcoordinated defects and dangling bonds. This light-sensitive structure can undergo significant changes including bond breakage, reconnection, and defect formation upon illumination with above-bandgap light. Light sensitivity makes a-Se a unique system to study the role of surface structure and dynamics on stable glass,Temperature dependence under pressure of the kinetics of,,Abstract The pressure (0·28–0·69 GPa)–temperature (382–409 K) dependence of the kinetics of the crystallization of amorphous Se to the trigonal phase has been investigated. The crystallized fraction-time data under different isobaric-isothermal conditions have been obtained, by monitoring the time dependence of the volume change, using the piston-displacement technique.

Electrochemistry of Selenium with Sodium and Lithium,

Among the electrode materials recently developed for sodium-ion batteries, selenium shows considerable promise because of its high capacity and good cycling ability. Herein, we have investigated the mechanism and kinetics of both sodiation and lithiation reactions with selenium nanotubes, using in situ transmission electron microscopy.Crystallization kinetics of amorphous Se,considered ‘‘model’’ material as amorphous selenium still contain questions and discrepancies. Moreover, no general consensus regarding the values of kinetic parameters has been reached [5,(PDF) Crystallization kinetics of amorphous selenium,,Crystallization kinetics of amorphous selenium prepared by ball milling technique: Evidence of three crystallization regimes. Abdalla Elabbar. IntroductionAmorphous materials are still a focus of intense research activity due to their scientific and technological importance [1]. Rapid melt quenching is commonly used for preparation of amorphous materials. Extremely high cooling rates are often,

Kinetic Processes in Amorphous Materials Revealed by,

In case of amorphous selenium, the position of T e appears to be driven more by viscous flow (in combination with surface tension) at low temperatures. Thus, the activation energy determined from the TMA measurements at low q + gets closer to E η. There are of course many consequences associated with the temperature variation of crystallization activation energies. In the last part of the,Crystallization of amorphous selenium films. I.,We report a study of the morphology and kinetics of crystallization of films of a ‐Se vapor deposited on mica substrates. Morphological examination was facilitated by the complete dissolution of the amorphous component of the films by CS 2, while the crystalline component was left essentially intact.Kinetic Processes in Amorphous Materials Revealed by,,Kinetic Processes in Amorphous Materials Revealed by Thermal Analysis: Application to Glassy Selenium Jirˇí Málek * and Roman Svoboda Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 95, 53210 Pardubice, Czech Republic * Correspondence: [email protected]; Tel.: +420-466-036-553 Academic Editor: Sergey Vyazovkin

Photo-effect on crystallization kinetics of amorphous,

The method of change in electrical conductivity has been applied to investigate the illumination effect on the crystallization of amorphous selenium containing 4.26 at.% sulphur. Kinetic analysis of the crystallization process in the temperature range of 98-144°C together with microstructure studies have been used to illustrate that the light has two effects: a pure thermal one that appears,Polyamorphism of vapor-deposited amorphous selenium,In amorphous selenium (a-Se) both the structure and dynamics of the surface can be altered when exposed to above-bandgap light. Here we investigate the effect of light on the properties of vapor-deposited a-Se glasses at a range of substrate temperatures and deposition rates. We demonstrate that deposition both under white light illumination and in the dark results in thermally and kinetically,Polyamorphism of vapor-deposited amorphous selenium,Amorphous selenium (a-Se) has a complicated molecular structure with overcoordinated defects and dangling bonds. This light-sensitive structure can undergo significant changes including bond breakage, reconnection, and defect formation upon illumination with above-bandgap light.

Digital radiography using amorphous selenium,

A new amorphous selenium (a-Se) digital radiography detector is introduced. The proposed detector generates a charge image in the a-Se layer in a conventional manner, which is stored on electrode pixels at the surface of the a-Se layer. A novel method, called photoconductively activated switch (PAS), is used to read out the latent x-ray charge image. The PAS readout method uses lateral,Temperature dependence under pressure of the kinetics of,,Abstract The pressure (0·28–0·69 GPa)–temperature (382–409 K) dependence of the kinetics of the crystallization of amorphous Se to the trigonal phase has been investigated. The crystallized fraction-time data under different isobaric-isothermal conditions have been obtained, by monitoring the time dependence of the volume change, using the piston-displacement technique.(PDF) Crystallization kinetics of amorphous selenium,,Crystallization kinetics of amorphous selenium prepared by ball milling technique: Evidence of three crystallization regimes. Abdalla Elabbar. IntroductionAmorphous materials are still a focus of intense research activity due to their scientific and technological importance [1]. Rapid melt quenching is commonly used for preparation of amorphous materials. Extremely high cooling rates are often,

Kinetics of crystallization of amorphous selenium under,

Mohan, M and Singh, AK (1993) Kinetics of crystallization of amorphous selenium under isobaric isothermal conditions. In: Proc. DAE Solid State Physics Symposium, 1993, Bombay, India. Full text not available from this repository. AbstractPolyamorphism of vapor-deposited amorphous selenium,In amorphous selenium (a-Se) both the structure and dynamics of the surface can be altered when exposed to above-bandgap light. Here we investigate the effect of light on the properties of vapor-deposited a-Se glasses at a range of substrate temperatures and deposition rates. We demonstrate that deposition both under white light illumination and in the dark results in thermally and kinetically,The kinetics of indium/amorphous-selenium multilayer,The kinetics of indium/amorphous-selenium multilayer thin film reactions - Volume 14 Issue 3 - K. Lu, M. L. Sui, J. H. Perepezko, B. Lanning

Model-free method for analysis of non-isothermal kinetics,

Crystallization kinetics of amorphous selenium prepared by ball milling technique: Evidence of three crystallization regimes. By Abdalla Elabbar. Crystallization kinetics study of Pb4.3Se95.7 chalcogenide glass using DSC technique. By Abdalla Elabbar. Determination of activation energy of amorphous to crystalline transformation for Se 90 Te 10 using isoconversional methods. By Nema Abdelazim,X-ray Imaging Research Group - Amorphous Selenium (a,Amorphous Selenium (a-Se) Many of the detector systems being developed in our lab use a photoconductor called amorphous Selenium (a-Se) as the X-ray detector material, i.e. the material which 'catches the X-rays', and converts them to either charge or lower energy photons. On this page we describe photoconductors and compare them with phosphor screens, and discuss why we choose toDigital radiography using amorphous selenium,,A new amorphous selenium (a-Se) digital radiography detector is introduced. The proposed detector generates a charge image in the a-Se layer in a conventional manner, which is stored on electrode pixels at the surface of the a-Se layer. A novel method, called photoconductively activated switch (PAS), is used to read out the latent x-ray charge image. The PAS readout method uses lateral,

Microscopic modeling of high-field charge transport in,

amorphous Selenium by Ali Darbandi A thesis submitted in conformity with the requirements for the degree of Master of Science in Department of Physics Lakehead University cAli Darbandi, 2012 October 26, 2012 . ABSTRACT Avalanche multiplication of charge carriers as a result of successive impact ionization has led tothedevelopmentofsolid stateavalanchephoto-detectors. Crystalline,Nonisothermal crystallisation kinetics of amorphous,,Abstract Differential scanning calorimetry (DSC) studies were performed under nonisothermal conditions at various heating rates for glassy Se made by high-energy ball milling. Comparisons were made between the ball-milling technique and the melt-quenching and thin-film techniques. Well-defined endothermic and exothermic peaks were observed at the glass-transition temperature, Tg, and theComparative study of the photodarkening relaxation,,The relaxation of photodarkening (PD) brought about by above-bandgap and sub-bandgap excitations is studied in a wide temperature range in amorphous selenium (a-Se) films designed for avalanche photodetectors. The experimental results suggest that in contrast to sub-bandgap excitation, above-bandgap excitation does not cause the formation of self-trapped excitons, viz., photoinduced,

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