On the Dielectric Study of Se80−x Te20Pb x (x = 0, 1 and 2) Glasses

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

“…wt.% has greater thermal stability among investigated alloys [18,19]. Furthermore, in our earlier measurements on AC conductivity and dielectric study in Se-Te-Pb system illustrate considerable influence of Pb addition on conduction mechanism [17]. The fundamental interest in multicomponent quaternary chalcogenide alloys has been revived due to the observation of quick reversible laser-induced crystalline to amorphous and amorphous to crystalline phase transitions.…”

“…The highly intense structural peak is observed at 2θ ≈ 29° in the XRD pattern for all investigated samples. Moreover, the shift is in the direction of lower value of 2θ that indicates contraction of crystal structure along with extension of lattice parameters due to replacement of Se by Pb [1,17]. This shift can be attributed to an increase in grain size, lattice spacing, dislocation densities, and microstrain, which is due to imperfections within the crystalline lattice.…”

“…It also signifies the polycrystalline nature of doped nanocrystalline composition. The Scherrer's formula [17] has been used for deducing average crystallite size (D XRD ) of investigated alloys:…”

“…This in turn produces thermally more stable glassy alloys by reducing aging effect and enhancing glass forming ability. Pb doping prominently makes an impact on physical, structural, electronic, optical, and thermal properties of host material [2,17]. Our preceding research on ternary Se-Te-In composition signifies that In = 6 at.…”

“…In device fabrication, the lattice perfection and the optical gap of the material plays an important role which can be modified by the insertion of the doping element like Pb. The insertion of trace element like Pb may enhance the valance alteration pair (VAP)-type defects, limiting molecular mobility, and connecting neighboring chains, which causes p to n transition in certain chalcogenide systems [2,17]. All these eminent characteristics indicate that Pb is exclusive amongst the trace element in case of semiconducting chalcogenide materials.…”