Absorption Spectra of Neodymium Doped Tellurite Glass

Abstract:

Modifying the optical and structural properties of tellurite glasses by controlling rare earth doping is an important issue. Neodymium doped magnesium-tellurite glasses of composition TeO₂-MgO-Na₂O with concentration from 0.5 to 2.5 mol% were synthesized by conventional melt-quenching technique. The amorphous natures of the glass were confirmed from x-ray diffraction (XRD) pattern. The absorption spectra (exhibits five bands) were recorded to determine the optical energy gap and Urbach energy. The values of the optical band gap are found to lie between 3.04-3.20 eV, while the Urbach energy values varies are between 0.21-0.12 eV. The optical energy gap for indirect forbidden transition has increased whereas the values of Urbach energy have decreased with the increasing of Nd₂O₃ content. The structural and optical properties were found to be strongly affected by the varying concentration of Nd³⁺ ions.

• Periodical: Advanced Materials Research (Volume 895)
• Pages: 395-399
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.895.395
• Online since: February 2014
• Authors: Nur Amanina Mat Jan, M.R. Sahar, Sib Krishna Ghoshal, R. Ariffin, M.S. Rohani, K. Hamzah
• Keywords: Neodymium, Optical Band Gap, Tellurite Glass, Urbach Energy

References

[1] S. Rosmawati, H.A.A. Sidek, A.T. Zainal and H. Mohd Zobir: J. Applied Sci. 7 Vol. 3051-3056 (2007), p.20.

DOI: 10.3923/jas.2007.3051.3056

[2] G. Vijaya Prakash, D. Narayan Rao and A. K. Bhatnagar: Solid State Commun. Vol. 119 (2001), p.39.

[3] M.R. Sahar and N. Noordin: J. Non-Cryst. Solids Vol. 137-140 (1995), p.184.

[4] M.R. Sahar, A.K. Jehbu and M.M. Karim: J. Non-Cryst. Solids Vol. 164-167 (1997), p.213.

[5] L.M. Sharaf El-Deen, M.S. Al Salhi and Meawad M. Elkholy: J. Alloys and Comp. Vol. 465 (2008), pp.333-339.

[6] J. Tauc and A. Menth: J. Non-crystal Solids Vol. 8 (1972) 569.

[7] R. El-Mallawany, M. Dirar Abdalla and I. Abbas Ahmed: Mater. Chem. And Phys. Vol. 109 (2008), pp.291-296.

[8] S.Y. El-Sayed: J. Phys. D Applied Phys. Vol. 38 (2005), pp.3970-3975.

[9] R.P. Sreekanth Cakradar, G. Sivaramaiah, R. Lakshmana and N.O. Gopal: Spectrochim. Acta Vol. 62 (2005), p.761.

[10] N. Mott, E. Davis: Electronic Process in Non-Crystalline Materials (Oxford University Press, London 1971).