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Optical band gap and FT-IR studies on Cu2+ doped 20ZnO + x Li2O + (30-x) Na2O + 50B2O3 glasses

T. RAGHAVENDRA RAO1,* , CH. VENKATA REDDY1,2, U. S. UDAYCHANDRAN THAMPY1,3, CH. RAMA KRISHNA1, Y. P. REDDY4, P. SAMBASIVA RAO5, R. V. S. S. N. RAVIKUMAR1

Affiliation

  1. Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar-522 510, India
  2. Department of Physics, K.L. University,Guntur-522 502, India
  3. Department of Physics, University of Kerala, Kariavattom Campus, Thiruvananthapuram, Kerala-695581, India
  4. Co-ordinator, Physical Sciences, Sri Padmavati Mahila Viswavidyalayam, Tirupati -517 502, India
  5. Department of Chemistry, Pondicherry University, Pondicherry- 605 014, India

Abstract

The spectral studies on 20ZnO+xLi2O+(30-x)Na2O+50B2O3 (5 x 25) doped with 0.1 mol% of paramagnetic CuO impurity are carried out. XRD patterns of powder glass samples confirm the amorphous nature. Urbach energies are shown the structural stability of the systems. The optical band gap energies varies non-linearly within the range of 3.818 – 4.073 eV for direct and 3.770 – 4.024 eV for indirect transitions with the increase of Li2O content. The FT-IR spectral studies show that the glass systems contain BO3 and BO4 units in disordered manner. The structural changes have been observed with alkali contents of the systems. It is observed that the system is more stable at x = 20 mol%. Mixed Alkali Effect phenomenon has been explained in the glass host..

Keywords

Mixed alkali zinc borate glass, Absorption edge, Optical band gap, Urbach energy and FT-IR.

Citation

T. RAGHAVENDRA RAO, CH. VENKATA REDDY, U. S. UDAYCHANDRAN THAMPY, CH. RAMA KRISHNA, Y. P. REDDY, P. SAMBASIVA RAO, R. V. S. S. N. RAVIKUMAR, Optical band gap and FT-IR studies on Cu2+ doped 20ZnO + x Li2O + (30-x) Na2O + 50B2O3 glasses, Optoelectronics and Advanced Materials - Rapid Communications, 7, 1-2, January-February 2013, pp.43-48 (2013).

Submitted at: July 24, 2012

Accepted at: Feb. 20, 2013