Optical properties of Na2SO4–B2O3–P2O5 glasses doped with TiO2. (2018)

• Record Type: Journal Article
• Authors: Srinivasa Rao, Ch.; Seshulatha, K.; Gurupria, Y.S.; Sagar, Prem; VijayKumar, M.; SaibabaVali, S.; Ramanjaneyulu, D.; Kotireddy, S.
• Is Part Of: Materials today. Volume 5:Number 13(2018)Part 1
• Page Start: 26217
• Page End: 26222
• Publication Date: 2018
• Subjects: Titanium ions -- Optical absorption -- ESR -- IR spectra; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2018.08.070
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Na2 SO4 –B2 O3 –P2 O5 glasses doped with different concentrations of TiO2 (0 to 1.0 mol%) have been synthesized. The IR, optical absorption and ESR spectral studies have been studied. The analysis of IR spectral results have also indicated that, in the samples containing higher concentration of TiO2, the asymmetric vibrational bands of phosphate groups dominates over symmetric bands. These factors indicate an increase in the concentration of NBO's in the glass network with increase in the concentration of TiO2. The bands observed in the optical absorption spectra at about 540 nm and 690 nm of the studied glass are assigned to 2 B2g → 2 B1g and 2 B2g → 2 A1g transitions of the Ti 3+ ions. In the ESR spectra the central line observed at 1.987 is due to tetragonally compressed octahedral excitations of Ti 3+ ions from the ground state. The increasing intensity and half-width of the signal observed with the increase in the content of TiO2 suggests a gradual increase in the concentration of Ti 3+ ions in the glass network. The IR, optical absorption and ESR spectral studies pointed out that a part of titanium ions do exist in Ti 3+ state in addition to Ti 4+ state especially in the samples containing higher concentration of TiO2 .