Open AccessThermal and structural studies of Bismuth Borate glasses modified with Gadolinium Oxide for solid state lighting applications
Author(s) -
M Prasanth,
N Ravi,
K. Thyagarajan,
K. Venkata Krishnaiah
Publication year - 2022
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1233/1/012002
Subject(s) - boron , materials science , raman spectroscopy , glass transition , bismuth , analytical chemistry (journal) , borate glass , excited state , x ray photoelectron spectroscopy , heat capacity , lithium borate , oxide , impurity , chemistry , nuclear magnetic resonance , thermodynamics , polymer , optics , metallurgy , composite material , physics , organic chemistry , chromatography , nuclear physics
Bismuth based borate glasses with combination B 2 O 3 –Bi 2 O 3 – Gd 2 O 3 - K 2 O-Li 2 O (BBiGdKLi) were prepared by melt-quenching method at 1250 °C for thermal and structural properties investigation.. Glass transition temperature (T g ) was observed at 681 K in heat capacity (C p ) vs temperature plot. As the temperature increases the specific heat or heat capacity also increases but a sudden fall in C p was noticed at 962 K which is known to be crystalline temperature (T c ) of BBiGdKLi glass. Borate units comprising non-bridging oxygen (NBO) such as υ(B-O-Gd/Bi/K/Li) occured due to asymmetric stretching vibration at 976 cm -1 revealed in Raman spectrum excited by 532 nm laser. B1s, Bi 4f and Gd 4d binding energies from the XPS spectra of BBiGdKLi glass are corresponding to 188.9, 156.35 & 161.75 and 156.35 & 161.7 eV, respectively. The thermal behavior of BBiGdKLi glass suggest that these glasses could be significant materials for solid state lighting applications.