Open AccessShort-Range Structural Insight into Lithium-Substituted Barium Vanadate Glasses Using Raman and EPR Spectroscopy as Probes
Author(s) -
Parul Goel,
Gajanan V Honnavar
Publication year - 2021
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.1c03544
Subject(s) - electron paramagnetic resonance , raman spectroscopy , vanadate , octahedron , tetragonal crystal system , lithium (medication) , materials science , barium , chemistry , vanadium , analytical chemistry (journal) , crystallography , nuclear magnetic resonance , inorganic chemistry , crystal structure , optics , medicine , physics , chromatography , endocrinology
We present a corroborative study of the structural characterization of lithium-substituted barium vanadate glasses using Raman and electron paramagnetic resonance (EPR) spectroscopy. Investigation of the thermal and physical properties of these glasses showed a gradual increase in the concentration of nonbridging oxygen. Raman and EPR analysis gave an insight into the changing structure of the glasses. Both the spectroscopic techniques confirmed that vanadium is present in the glasses as distorted VO 6 octahedra. From the analysis of both spectroscopic techniques, it is proposed that the lithium ion prefers to occupy planar positions of the VO 6 octahedra, thus reducing the tetragonal distortion and making the environment around the network-forming unit in the glass matrix more homogeneous as we increase the lithium content. The concentration of V 4+ showed a non-monotonic variation with an increase in Li 2 O as indicated by Raman studies and confirmed by EPR, which indicates a structural change in the distorted VO 6 octahedra.