Abstract
AbstractBulk glasses of Se−Ge‐Bi system have been prepared by quenching the melt. The XRD exhibits very weak peaks riding over halos. DSC scans show a single stage to a multistage crystallization with an incremental substitution of Ge by Bi, indicating evolution of structurally inhomogeneous phases at the molecular level with the increasing content of Bi. The Raman spectra (50‐500 cm‐1) reveal the formation of the corner and edge‐sharing GeSe4/2terahedral and Bi2Se3 pyramidal units. Transmission electron microscope (TEM) Images depicts the formation of submicron to nano‐sized spherical shaped structural units in a chain‐like configuration. Fragmentation of chains and refinement effect of Bi are noticed in TEM and SEM Images. The optical absorption edge found to be red‐shifted along with a sharp decrease in optical band gap (1.74‐0.82), with the increasing fraction of Bi in alloys. Attempts have been made to elucidate the results on the structural considerations (bond and band diagram) and Burstein‐Moss effect.
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