Assessment of role of iron ions on the physical and spectroscopic properties of multi-component Na2O−PbO−Bi2O3−SiO2 glass ceramics. (2nd January 2018)

• Record Type: Journal Article
• Authors: Rao, M. V. Sambasiva; Kumar, A. Suneel; Ram, G. Chinna; Tirupataiah, Ch.; Rao, D. Krishna
• Is Part Of: Phase transitions. Volume 91:Number 1(2018)
• Page Start: 92
• Page End: 107
• Publication Date: 2018-01-02
• Subjects: Multi-component glass ceramics -- XRD -- DTA -- optical absorption -- EPR spectra; Phase transformations (Statistical physics) -- Periodicals; 530.47405
• DOI: 10.1080/01411594.2017.1372759
• Languages: English
• ISSNs: 0141-1594

Abstract

ABSTRACT: Multi-component glass ceramics composition Na2 O−PbO−Bi2 O3 −SiO2 doped with different concentrations of Fe2 O3 as nucleating agent were characterised by XRD, SEM (scanning electron microscope) and DTA (differential thermal analysis) techniques. Optical absorption, EPR, FTIR and Raman studies are also carried out on these glass ceramics. Absorption bands observed at about 457, 489, 678 and 820 nm are the characteristics of Fe 3+ ions whereas the band observed at about 964 nm is due to Fe 2+ ions. EPR studies suggested that Fe 3+ ions entered in the lattice as tetragonally distorted octahedral symmetry or rhombic sites at low concentration of Fe2 O3, whereas at higher concentration of Fe2 O3 (beyond 1 mol%), the super exchange type of interactions between multivalency iron ions begin to dominate. FTIR and Raman spectra have revealed the behaviour of various structural units in the glass ceramic matrix. The analysis of these spectroscopic studies indicates that iron ions do exist in Fe 3+ and Fe 2+ state.