期刊
PHASE TRANSITIONS
卷 95, 期 4, 页码 308-321出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/01411594.2022.2042537
关键词
Nano-chalcogenide; X-ray diffraction; FESEM; DSC; glass transition; particle size distribution
This study reports the structural transition and thermo-physical properties of (Se80Te20)(94-x)Ge6Pbx (0 <= x <= 12) chalcogenide alloys. It is found that structural modification and formation of nano-chalcogenide alloys occur with higher doping of Pb content. Additionally, the study investigates the variation of thermo-physical properties of the alloys with the addition of Pb content.
Pb chalcogenides have emerged as promising materials for advanced thermoelectric and optoelectronic devices. Structural transition and thermo-physical study of (Se80Te20)(94-x)Ge6Pbx (0 <= x <= 12) chalcogenide alloys are reported and discussed. Alloys under investigation have been prepared using melt-quench technique. Structural transformation has been analyzed using the X-ray diffraction and field emission scanning electron microscopy (FESEM). The X-ray diffraction pattern showed sharp peaks with x >= 8 at. wt.% signifying structural modification with higher doping of Pb content. The presence of characteristic peaks for Pb >= 8 at. wt.% indicates the formation of nano-chalcogenide alloys which is further confirmed by the FESEM. The chemical composition is checked by the energy dispersive spectroscopy. Variation of various thermo-physical properties of Se-Te-Ge alloys on addition of Pb content has been studied. Glass transition temperature is calculated using Tichy-Ticha and Lankhrost approaches and is found in concordance with experimental results. The chemical bond approach has been adopted to determine cohesive energy.
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