Optical absorption spectrum of (LiCl) x(P 2O 5) 1− x glass

• Published in: Ceramics international Vol. 30; no. 7; pp. 1715 - 1717
• Main Authors: Talib, Z.A., Loh, Y.N., Sidek, H.A.A., Yusoff, W.M.D.W., Yunus, W.M.M., Shaari, A.H.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier Ltd 2004; Elsevier Science
• Subjects: (LiCl) x(P 2O 5) 1− x glass; Absorption edge; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Density; Disordered solids; Exact sciences and technology; Optical band gap; Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity); Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physics; Visible and ultraviolet spectra; Optical band gap; Density; (LiCl) x (P 2O 5) 1− x glass; Absorption edge; Energy gap; Solid solutions; Optical properties; Glass; Ultraviolet visible spectrum; Chemical composition; Lithium chlorides; Absorption spectra; Experimental study; Phosphorus oxides
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2003.12.146

A series of glasses (LiCl) x (P 2O 5) 1− x with x=0.1–0.6 in the interval of 0.05 were prepared by a single-step melting process with LiCl and P 2O 5 as starting materials. Their density and absorption spectra in the ultra-violet visible (UV-Vis) region have been recorded at room temperature. The Urbach rule has been applied to evaluate the fundamental absorption edges for all the glasses from the obtained spectrum. The optical band gaps were calculated from the absorption edge and it was found that the optical band gap, E opt, depended on the glass composition. The optical band gap decreases to lower energies and shifts to longer wavelength with the increase in LiCl content in glass. The absorption edge is attributed to indirect transitions. The densities of glasses were found to be varying between 2.33 and 2.52 g cm −3 for mole fraction of 0.1–0.6. The average density was 2.42 g cm −3 and no evidence of anomalous densities’ behaviour was observed.