Crystallization kinetics of Si20Te80?xBix (0???x???3) chalcogenide glasses

Abstract

In this report, we investigate the crystallization kinetics of Si<inf>20</inf>Te<inf>80?x</inf>Bi<inf>x</inf> (0 ? x ? 3) chalcogenide glassy systems using differential scanning calorimetry (DSC) technique. Systematic studies are carried out in order to understand the variation of thermal parameters such as glass transition temperature (T<inf>g</inf>), onset crystallization temperature (T<inf>c</inf>) and peak crystallization temperature (T<inf>p</inf>) as a function of composition. Activation energy for glass transition (E<inf>g</inf>) and crystallization (E<inf>c</inf>) has been calculated based on the relevant statistical methods. Furthermore, thermal parameters such as change in specific heat (?C<inf>p</inf>), fragility index (F), thermal stability (?T)& (S), enthalpy (?H<inf>c</inf>), entropy (?S) are deduced to interpret distinct material behaviour as a function of composition. Structural evaluation like thermal devitrification studies elucidate the restricted glass formability of the studied glass system. Conclusively, a relationship has been established between the obtained thermal parameters and electrical switching characteristics. © 2019 Elsevier B.V.