ESR, IR and Optical Absorption Studies of Co2+ ions in ZnO-PbO-B2O3 glass System. | ||||
| Egyptian Journal of Solids | ||||
| Article 10, Volume 34, Issue 2, 2011, Page 130-148 PDF (795.22 K) | ||||
| DOI: 10.21608/ejs.2011.149126 | ||||
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| Abstract | ||||
| Glassy system of composition x Co2O3-(40-x) ZnO-10PbO-50B2O3, (where x = 0, 0.1, 0.3, 0.5 and 1 mol %) were prepared by conventional melt-quenching technique. The X-Ray Diffraction pattern of the glass samples shows no sharp peaks, indicating the amorphous nature. FT-IR spectra of the glasses show vibration modes corresponding to stretching of BO3 trigonal, BO4 tetrahedral units and of B-O-B bending bonds. The observed red shift of optical absorption edge (UV cutoff) show monotonous decrease in indirect optical band gap energy (Eopt) by increasing Co2O3 content in the glasses based on their absorption spectra. Absorption spectra of ZLB: Co2+ have exhibited two tetrahedral bands corresponding to (4T1g (F) →4T1g (P)) and (4T1g (F) →4A2g (F)) transitions and an octahedral band in (4T1g (F) →2T1g (D)) transition. ESR spectra exhibit characteristic resonance signals of Co2+ ions and a well resolved six line hyperfine structure. | ||||
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