Assessment of role of iron ions on the physical and spectroscopic properties of multi-component Na₂O−PbO−Bi₂O₃−SiO₂ glass ceramics

ABSTRACT

Multi-component glass ceramics composition Na₂O−PbO−Bi₂O₃−SiO₂ doped with different concentrations of Fe₂O₃ 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 Fe³⁺ ions whereas the band observed at about 964 nm is due to Fe²⁺ ions. EPR studies suggested that Fe³⁺ ions entered in the lattice as tetragonally distorted octahedral symmetry or rhombic sites at low concentration of Fe₂O₃, whereas at higher concentration of Fe₂O₃ (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 Fe³⁺ and Fe²⁺ state.

KEYWORDS:

• Multi-component glass ceramics
• XRD
• DTA
• optical absorption
• EPR spectra

Acknowledgments

The authors are thankful to the University Grants Commission (UGC) and the Department of Science and Technology (DST), New Delhi, India for sanctioning DSA and FIST level-I projects, respectively, to the Physics department of the university.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

University Grants Commission (UGC), New Delhi, India [file number F. 5301/11/DSA-1/2015 (SAP-1))]; Department of Science and Technology (DST), New Delhi, India [file number SR/FIST/PSI-163/2011 (C))].