ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Spectroscopic features of Tl₂O₃ mixed multi-component Li₂O–PbO–B₂O₃–SiO₂–Bi₂O₃–V₂O₅ glass system

P. Ramesh Babu, R. Vijay, Kishor Palle, L. Vijayalakshmi, Jong Dae Baek, D. Krishna Rao, S. Naga Gayatri, and Aboud Ahmed Awadh Bahajjaj

Department of Physics, Gokaraju Rangaraju Institute of Engineering and Technology, Hyderabad, India

E-mail: rameshpamidi2@gmail.com

Received: 28 June 2023  Accepted: 30 October 2023

Abstract:

The melt quenching procedure employs lithium lead borosilicate bismuth vanadate glasses containing varying amounts of Tl₂O₃ (from 0 to 5.0 mol%). Many spectroscopic investigations (Infrared, EPR and optical absorption) have also been explored. A vanadium ion exists both in the V⁴⁺ and V⁵⁺ states as shown by optical absorption and EPR experiments, and their ratio V⁴⁺/V⁵⁺ (redox ratio) is found to be lowest in glasses comprising 5.0 mol% of Tl₂O₃. The IR spectrum investigations demonstrated that when the concentration of Tl₂O₃ increases, the degree of disorder in the glass network reduces. Such shifts have now been ascribed to an increasing number of V⁵⁺ ions participating in network formation locations with VO₅ crystal structures. This is due to thallium ion migration from octahedral coordination to tetrahedral coordination, as well as a thallium ion de-clustering effect on the glass structure.

Keywords: Multi-component glasses; Vanadium ions; Optical absorption spectra; EPR

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-023-03196-2

Chemical Papers 78 (1) 623–629 (2024)