EPR and Optical absorption studies of PbO-CdO-TeO2-B2O3–CuO glasses

S. Vedavyas*, K. Chandra Sekhar**, G. Ramadevudu***, M. Narasimha Chary****, Md. Shareefuddin*****
* Department of Physics, University College of Science, Osmania University, Hyderabad, Telangana, India.
** Department of Physics, University College for Women, Osmania University, Hyderabad, Telangana, India.
*** Department of Physics, Vasavi College of Engineering, Hyderabad, Telangana, India.
****-***** Department of Physics, Osmania University, Hyderabad, Telangana, India.
Periodicity:October - December'2019
DOI : https://doi.org/10.26634/jms.7.3.16589

Abstract

The glasses with the composition 20PbO-(10-x)CdO-10TeO2-60B2O3-xCuO (0.5≤x≤2) were prepared by melt quenching technique. X-ray diffractograms revealed the amorphous nature of the glasses. Optical absorption spectra are recorded at room temperature. Optical band gap (Eopt) and Urbach energies were determined. Electron Paramagnetic Resonance (EPR) studies were carried out by introducing Cu2+ as the spin probe. EPR spectra of all the glass samples were recorded at X-band (≈9.7 GHz) frequencies. From the EPR spectra spin-Hamiltonian parameters were evaluated. It was observed that (g≈ 2.360, g ≈ 2.080) g >g>ge (2.0023) and (A≈ 136x10-4cm-1, A≈30 x10-4cm-1) A>A. From these values it is concluded that the ground state of Cu2+ is dx2-y2 (2B1g) and the site symmetry around Cu2+ ion was tetragonally distorted in octahedral sites. It was observed that the intensity of the EPR spectra increases with increase of CuO concentration, which shows that more number of Cu2+ ions are participating in the resonance. The optical absorption spectra revealed broad absorption band, which is assigned to 2B1g2B2g transition. From the EPR and Optical data bonding coefficients were evaluated and discussed.

Keywords

Metal Oxides; Borotellurite Glasses; Optical Band Gap; Spin-Hamiltonian Parameters; Bonding Parameters

How to Cite this Article?

Vedavyas, S., Sekhar, K. S., Ramadevudu. G, Chary, M. N., and Shareefuddin, M. (2019). EPR and Optical absorption studies of PbO-CdO-TeO2-B2O3–CuO glasses. i-manager’s Journal on Material Science, 7(3), 63-69. https://doi.org/10.26634/jms.7.3.16589

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