Abstract
Glasses having composition (25 + x)Li 2O·(65 − x)P 2O 5·10Bi 2O 3 (0 ≤ x ≤ 25 mol%) were prepared by normal melt quenching technique. The optical absorption spectra of the polished samples were recorded in spectral range from 200 to 3300 nm at room temperature. The optical absorption edge ( λ cutoff), optical band gap ( E g) and Urbach energy (Δ E) were determined from the absorption spectra. Variation in these optical parameters has been associated with the structural changes occurring in these glasses with increase in Li 2O:P 2O 5 ratio. Variation in density ( D), molar volume ( V M) and glass transition temperature ( T g) has also been correlated with structural changes in the glass samples. The FTIR spectra have been recorded in the spectral range from 400 to 1400 cm −1. The FTIR spectra show the rapid depolymerization of phosphate chains with increase in Li 2O content and P–O–Bi bonds are formed.
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Schedule a callMore From: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
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