On the structural and thermophysical study of Pb-doped Se-Te-In nanochalcogenide alloys

Abstract

Pb additive nanochalcogenide materials are becoming well-known materials in modern optoelectronics. In this paper, multicomponent Se-Te-In-Pb nanochalcogenide alloys are prepared using melt-quenching technique. The physical and submicron structural features of investigated system are reported and discussed. Characteristic peaks in x-ray spectra signify nanorange of each sample under investigation validated by FESEM and HRTEM. Influence of Pb content on examined composition has been deliberated with respect to their physical characterization namely average coordination number (<r>), mean bond energy (<E>), crosslinking density (X), lone-pair electrons (L), fraction of floppy modes (f), constraints (N c ), electronegativity (χ), cohesive energy (CE), glass transition temperature (T g ), and heat of atomization (H s ). It is realized that addition of Pb content, enhanced N c , X, and <r>. Whereas, <E>, L, f, χ, CE, T g , and H s decrease with Pb addition. Cohesive energy is analyzed through chemical-bond approach. T g is estimated by Tichy-Ticha and Lankhorst approaches and are found in consistent with experimental results. The band gap of investigated system has been calculated theoretically by Shimakawa's relation and deduced results are analyzed through cohesive energy, electronegativity, and average single-bond energy. Also the compositional dependence of experimentally derived optical band gap has been analyzed and discussed.

Peculiarities of Electrical Switching and Phase Transition Dynamics in Bismuth-Infused Se–Te Chalcogenide Glasses: From Bulk to Thin Film Devices

“…These impurities play a vital role in tuning the electrical properties of chalcogenide glasses. Among the array of phase-changing materials, selenium-rich chalcogenides within a Se–Te matrix have emerged as focal points. , These compositions exhibit diverse properties, spanning various glass formulations and demonstrating swift phase transitions . The incorporation of metals into the Se–Te matrix introduces an enticing prospect: the ability to finely adjust the electrical and switching characteristics of Se–Te-based chalcogenide glasses. , This alloying enhances the cross-linked structure, leading to distinct electrical switching behaviors.…”