Abstract
The structural evolution and shear relaxation behavior of binary Se100-xIx (0 ≤ x ≤ 3) glasses and supercooled liquids are investigated using Raman spectroscopy and parallel plate rheometry, respectively. The spectroscopic results indicate cleavage and termination of Se polymeric chains by I atoms via the formation of Se-I bonds, leading to shortening of the average chain length with progressive addition of I atoms. Moreover, at I contents of ≥ 2%, a fraction of the I atoms forms I2 dimers. The results from rheometry demonstrate that the structural relaxation rates associated with the fast segmental chain motion and the slow bond scission/renewal dynamics in Se100-xIx liquids increase upon addition of I, with the shortening of the chain length. The increased configurational degrees of freedom of shorter selenium chains leads to a decrease in the isothermal viscosity, Tg and the packing efficiency and an increase in fragility in liquids with higher I content.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
