Thermal Stability Criteria of Se_80-xTe₂₀Sb_xin Terms of Characteristic Temperatures and Kinetic Parameters

Abstract

Thermal stability in terms of characteristic temperature and kinetic parameters of dierent compositions of glassy Se80−xTe20Sbx (x = 0, 2, 4, 6, 8, 10) have been investigated. Dierential scanning calorimetry under nonisothermal conditions have been proposed to investigate thermal characteristic of these compositions. The thermal stability of these glasses was obtained in terms of various simple quantitative methods based on the characteristic temperatures, such as the glass transition temperature, Tg, the onset temperature of crystallization, Tin, the temperature corresponding to the maximum crystallization rate, Tp, and the melting temperature, Tm. Furthermore, the kinetic parameter Kr(T ) was achieved as another indicator for thermal stability and its results about stability compared with those evaluated by other criteria. The results of both the criteria and the kinetic parameter Kr(T ) conrm that the thermal stability increases with increase of Sb content. The results also refer to that: the glass transition Tg, activation energy of crystallization Ep and the frequency factor K0 were increased with the addition of Sb. These results have been discussed in terms of the average coordination number, cohesive energy and average heat of atomization.

Study of the crystallization behaviour in arsenic-sulphide glasses doped with Pb

“…The thermal stability of chalcogenide glasses and its tendency of glass formation are the most important limiting parameters to estimate the utility of these materials for use in practice, such as specific technological applications. Thermal stability is the direct measurement of stability against crystallization and so the aging effects are found less dominant in the glasses having high thermal stability [8,9].…”

“…Thermal stability indicates on glass resistance to the devitrification of glasses during the nucleation and growth processes [7,8]. Apart from the utility, implementation of these investigations is also significant for the estimation of durability of the devices fabricated from these materials [9].…”

Investigation of Structural and Optical Properties of Amorphous-Crystalline Phase Transition of As40S45Se15 Thin Films

“…This may be a result of the increase of the lattice parameter and hence the unit cell size. Also the amorphous-crystalline transformations after annealing are responsible for decrease of the film optical gap [9,20,30,39]. Additionally, the steepness parameter σ characterizing the broadening of the optical absorption edge due to electron-phonon or exciton-phonon interactions [40] was also computed for the as-prepared film (T = 300 K in this film) and annealed films from the subsequent equation:…”

“…These applications are possible due to their smaller phonon energies as compared to oxide glasses and their better-infrared transmission [3,4]. Additionally, the light processes display the possibility of using non-crystalline semiconductors for wide technological applications such as xerography switching, photolithographic process, filters, modulators, scanning near field microscopy/spectroscopy, and more recently as reversible phase change optical recorders [5][6][7][8][9][10][11]. Many physical deposition techniques are available for the growth of As-S-Se thin films [12,13].…”

Morpho-Structural and Mechanical Characterization of Alloyed Steel

“…The soft iron still remains the best material for DC electromagnets, because its high saturation flux density allows obtaining an important magnetic flux homogeneously distributed. Also The Fe-Ni alloys, often called permalloys, are the most versatile from all the known soft magnetic materials [3][4].…”