Abstract
Glasses with the chemical compositions 60% B2O3-20% Na2O-(20-x) % Bi2O3-x% Nb2O5 (where, x = 0, 5, 10 and 15 mol. %), were prepared by fast quenching of their melts. Characteristics of the obtained solids were checked by XRD, FTIR and optical absorption spectroscopy. XRD data confirmed the amorphous nature of the glass samples. FTIR results revealed no changes in the ratio of the structural units BO3:BO4 when replacing Bi2O3 by Nb2O5. Moreover, both Bi3+ and Nb5+ cations occupied octahedral coordination states and both acted as glass network modifiers. Optical studies affirmed that the lowest value of both direct and indirect optical band gaps was obtained in samples with equal concentration of Nb2O5 and Bi2O3. All optical absorption bands were elucidated in terms of the terminal oxygen atoms around Nb5+ and/or Bi3+ cations. The optical nonlinearity of the glass samples was assessed in terms of absorption coefficient and the value of the optical band gap.
Highlights
Nonlinear optical behavior of amorphous materials has been extensively studied by several researchers because of its promising usage in photonic devices applications (Boyd, 2003; Sutherland, 2003)
The present work aimed at studying the effect of replacing bismuth oxide Bi2O3 by transition metal oxide Nb2O5 in the sodium bismuth borate glass, until the total replacement of Bi2O3 by Nb2O5
Structural analysis results manifested the amorphous nature of the materials and the correlation between the non-bridging oxygen and the optical absorbance of the glass system
Summary
Nonlinear optical behavior of amorphous materials has been extensively studied by several researchers because of its promising usage in photonic devices applications (Boyd, 2003; Sutherland, 2003) In this regard, bismuth borate glasses have caught great attention due to their facile and low cost synthesis, enhanced mechanical and chemical stability, in addition to the large range of nonlinear refractive index and nonlinear absorption coefficient (Farouk et al, 2013; Shanmugavelu et al, 2013). It was reported that introducing niobium oxide into the glass matrix increases the activation energy and the glass transition temperature Tg (Sene et al, 2004) Optical properties such as optical band gap and optical basicity were strongly improved when Nb2O5 was introduced into the glass system containing Bi2O3 (Sanghi et al, 2010; Swapna et al, 2017).
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