Influence of Bi2O3 on optical properties and structure of bismuth lithium phosphate glasses
2008; Elsevier BV; Volume: 477; Issue: 1-2 Linguagem: Inglês
10.1016/j.jallcom.2008.10.048
ISSN1873-4669
AutoresSunita Rani, Sujata Sanghi, Ashish Agarwal, Neetu Ahlawat,
Tópico(s)Photorefractive and Nonlinear Optics
ResumoGlasses having compositions xBi2O3·(50 − x)Li2O·50P2O5 and xBi2O3·(60 − x)P2O5·40Li2O (0 ≤ x ≤ 15, mol%) were prepared by normal melt quenching technique. The density (D), molar volume (VM), glass transition temperature (Tg), structure and optical properties have been investigated in order to understand the role of Bi2O3 in these glasses. Variations D, VM and Tg have been correlated with structural changes in the glass samples. The optical absorption edge (λcut-off), optical band gap (Eg) and Urbach energy (ΔE) were determined from the optical absorption spectra of the polished samples recorded in the spectral range from 200 to 3300 nm at room temperature (RT). Variation in these optical parameters has also been associated with the structural changes occurring in these glasses with increase in Bi2O3 content. The FTIR spectra have been recorded in the spectral range from 400 to 1400 cm−1. The structural investigations based on these spectra show the rapid depolymerization of phosphate chains with increase in Bi2O3 content and formation of P–O–Bi bonds. Also, Bi is incorporated as BiO6 octahedra in the glass matrix.
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