Abstract
Novel oxy-sulfide glass system xPbS-(73 − x) Bi2O3–27B2O3 with 6.06 ≤ x ≤ 36.35 named lead sulfide bismuth borate (LSBB) was prepared using normal melt and quench-casting technique. Phase transition temperatures tg, tx, tpi, and tl were noted from the DTA curves. Glass transition temperature tg varied from 306 ± 2 to 336 ± 2 °C and the onset of crystallization temperatures tx was between 331 ± 2 and 402 ± 2 °C. The glasses melted in the range 523 ± 2 to 597 ± 2 °C. The ratio tg/tl showed that compositions reported conform to the two-third law of glass formation. Hruby’s coefficient Hr witnessed the thermal stability of the system and that LSBB4 was most stable and glass formability factor kgl showed that composition LSBB1–LSBB6 can easily corroborate vitreous state. The direct band gap energy varied from 1.56 to 3.07 eV, while indirect band gap energy for the fundamental absorption edge was 0.21–1.31 eV. Absorption edges obeyed Urbach rule. A broad range of band tailing was exhibited confirming amorphous state of the system.
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