Structural and spectroscopic investigations of multi-component PbO ̶ Al2O3 ̶ TeO2 ̶ GeO2 ̶ SiO2 glass ceramics doped with NiO
| Main Authors: | Ch Tirupataiah, D Krishna Rao |
|---|---|
| Format: | Article Journal |
| Terbitan: |
, 2018
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/1491807 |
Daftar Isi:
- Multi-component glass ceramics with composition PbO ̶ Al2O3 ̶ TeO2 ̶ GeO2 ̶ SiO2 doped with NiO ranging from 0 to 1.6 mol % were synthesized through melt quenching technique subsequent by heat treatment. XRD and SEM techniques were employed for confirmation of ceramic nature of the prepared samples. Besides this some other analytical techniques viz., optical absorption and FTIR studies were also employed on these glass ceramics. XRD patterns of the prepared samples have exhibited different crystalline phases. Optical absorption spectra of these samples have exhibited three octahedral bands around 1405, 805 and 435nm and one tetrahedral band at about 648 nm. Optical band gap energies were computed from the Tauc's plots and these are found to increase slowly from 0.2 to 1.0 mol% of nucleating agent NiO beyond this concentration the decreasing trend in it is noticed. FTIR spectrum of the titled glass ceramics have exhibited various vibrational bands viz., Si-O-Si; Si-O-Ge; O-Si-O; and different asymmetrical structural units, such as PbO6; GeO6; TeO3; AlO6 and symmetrical structural units viz., SiO4; GeO4; PbO4 and TeO4 etc., in the glass ceramic network. Therefore, the analysis of these spectroscopic investigations suggests that the glass ceramics doped with 1.6 mol% of NiO exhibit semiconducting nature.