Mixed alkali effect in  Li2O-Na2O-WO3-TeO2 glasses : Optical Parameters

Authors

  • Kalsani Venkateshwarlu  Department of Physical Sciences, Kakatiya Institute of Technology & Science, Warangal, India

Keywords:

Mixed Alkali Effect, Tungsten Based Glasses, Density, Glass Transition Temperature, Optical Absorption.

Abstract

Glasses with composition xLi2O-(30-x)Na2O-20WO3-50TeO2 (where x= 0, 5, 10, 15, 20, 25 and 30 mol%) have been prepared using the melt quenching technique. In the present work, the mixed alkali effect (MAE) has been investigated in the above glass system through density and modulated DSC studies. The density and glass transition temperature of the present gasses varies non-linearly, the exhibiting the mixed alkali effect. From the optical absorption studies, the values of direct optical band gap, indirect optical band gap energy (Eo) and Urbach energy(ΔE) have been evaluated. The values of Eo and ΔE vary non-linearly with composition parameter, showing the mixed alkali effect.

References

  1. A. Edukondalu, Ch. Srinivasu, Syed Rahman, K. Siva Kumar, Int. J. Sci. Eng. Res. 5(3) (2014)  258-262.
  2. Ch. Srinivasu, Ch. Mallika, G. Sriram,  Abdul Hameed, A. Edukondalu, Int. J. Sci. Eng. Res. 5(3) (2014) 263-266.
  3. A. Edukondalu, M.A.Samee, S. K. Ahmmad, Sair Md. Taqiullah,  Syed Rahman,K. Siva Kumar, Int. J. Mod. Phys.  conf.  ser.  22 (2013) 278-283.
  4. Ch. Srinivasu, M.A. Samee, A. Edukondalu,  Syed Rahman, Int. J. Mod. Phys.  conf.  ser. 22 (2013) 284-291.
  5. A. Edukondalu, B. Kavitha, M. A. Samee, Shaik. Kareem ahmmad, Syed Rahman, K. Siva kumar, J. Alloys Compd. 552 (2013) 157 -165.
  6. A. Edukondalu, B. Kavitha, Abdul Hameed, K. Siva Kumar, IOP Conf. Ser. Mater. Sci. Eng. 73 (2015) 012127.
  7. Shaik  Kareem Ahmmad, M. A. Samee, A.Edukondalu, Syed Rahman,  Results in Physics, 2 (2012)  175-18.
  8. A. Edukondalu, V. Sathe, Syed Rahman and  K. Siva Kumar, Physica B, 438 120-126 (2014).
  9. N. Srinivasa Rao, Shashidhar Bale, M. Purnima, K. Siva Kumar and Syed Rahman,  Bull.  Mater. Sci., 28 6589-592 (2005).
  10. A. Edukondalu, B. Kavitha,  Syed Rahman, Ajay Gupta,  K. Siva  Kumar,  Optik., 126 2163 -2166 (2015).
  11. M. Purnima Avula Edukondalu, K. Siva Kumar,  Syed Rahman, , J. Mater. Res. 20(1) (2017) 46-52
  12. A.  Edukondalu, M.  Purnima, CH. Srinivasu, T. Sripathi, A. M. Awasthi,  Syed Rahman and K.  Siva Kumar,  J. Non-Cryst. Solids,  358 2581-2588 (2012).
  13. H. Kawazoe, H. Hosono and  T. Kanazawa,   J. Non-Cryst Solids 29 173-186 (1978).
  14. Abdul Hameed, B.Srinivas, A. Edukondalu, Md. Shareefuddin, M. Narasimha Chary,  Phys. Chem. Glasses: Eur. J. Glass Sci. Technol. B,  56 (6) (2015) 263-266
  15. Avula Edukondalu, T. Sripathi, Shaik Kareem Ahmmad, Syed Rahman, K. Sivakumar, J. Elect. Mater.  46(2) (2017)  808-816.
  16. A. Edukondalu, CH.Srinivasu, Syed Rahman, V. Sathe, K. Siva Kumar, AIP conf. Proc. 1591 (2014) 836
  17. G. Van Veen, J. Magn. Res., 30 91-99 (1978.)                        18A. Edukondalu, K.  Siva  Kumar,  D.  Sreenivasu, Vib.  Spect. 71 (2014)  91-97.
  18. A. Edukondalu, B. Kavitha,  Abdul Hameed, R. Vijaya Kumar, K. Siva Kumar, Mater. Today. Proc.  2 (2015) 913-917.
  19. M. A. Samee, A. Edukondalu, Shaik Kareem Ahmmad,  Sair MD. Taqiullah, Syed Rahman, J. Elect. Mater.  42 (2013) 2516.
  20. M. Purnima Avula Edukondalu, K. Siva Kumar,  Syed Rahman, , Phys. Chem. Glasses: Eur. J. Glass Sci. Technol. B,  57 (4) (2016) 198-203

International Journal of Scientific Research in Science, Engineering and Technology

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Published

2017-10-31

Issue

Volume 3, Issue 6, September-October-2017

Section

Research Articles

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How to Cite

[1]
Kalsani Venkateshwarlu "Mixed alkali effect in  Li2O-Na2O-WO3-TeO2 glasses : Optical Parameters" International Journal of Scientific Research in Science, Engineering and Technology (IJSRSET), Print ISSN : 2395-1990, Online ISSN : 2394-4099, Volume 3, Issue 6, pp.672-675, September-October-2017.