Sains Malaysiana 43(6)(2014):
899–902
Optical Properties of Lithium Borate Glass (Li2O)x (B2O3)1-x
(Sifat
Optik Kaca Litium Borat (Li2O)x (B2O3)1-x)
M.K. HALIMAH1*, W.H. CHIEW1, H.A.A. SIDEK1, W.M. DAUD1, Z.A. WAHAB1, A.M. KHAMIRUL1 & S.M. ISKANDAR2
1Department
of Physics, Faculty of Science, Universiti Putra Malaysia, 43400
Serdang,
Selangor, Malaysia
2Medical Physics
and Biophysics Research Laboratory, School of Physics, Universiti
Sains Malaysia, 11800 Minden, Penang, Malaysia
Diserahkan:
26 April 2013/Diterima: 13 Januari 2014
A series of (Li2O)x(B2O3)1-x has been
synthesized with mole fraction x=0.10, 0.15,0.20,0.25 and 0.30 mol% using melt
quenching method. The structure of the glass system was determined by FTIR and
X-ray diffraction. The density and molar volume were determined and the density
increases with Li2O content whereas molar volume decreases with Li2O. Refractive
index of glass samples were measured by ellipsometer. Refractive index
increases with increase of Li2O. The absorption spectra of the studied glass showed
that position of fundamental absorption edge shifts to longer wavelength with
Li2O. Optical band gap varies from 0.10 to 2.22 eV and Urbach energy varies
from 2.91 to 1.55 eV. The variation in optical band gap and Urbach energy were
due to the variation in the glass structure.
Keywords: Borate glass; optical band
gap; refractive index
ABSTRAK
Satu siri kaca (Li2O)x(B2O3)1-x telah disintesis dengan pecahan mol x = 0.10, 0.15,0.20,0.25 dan 0.30 mol%
dengan menggunakan kaedah sepuh lindap. Struktur sistem kaca ditentukan oleh
FTIR dan sinar belauan X. Ketumpatan dan isi padu molar telah ditentukan dan
ketumpatan meningkat dengan kandungan Li2O dan isi padu molar berkurang dengan Li2O. Indeks biasan sampel kaca diukur dengan ellipsometer. Indeks biasan
meningkat dengan peningkatan Li2O. Spektra serapan bagi kaca yang dikaji menunjukkan pinggir asas serapan
berubah ke jarak gelombang yang lebih panjang dengan Li2O. Jurang jalur optik berubah daripada 0.10 kepada 2.22
eV dan tenaga Urbach berubah daripada 2.91 kepada 1.55 eV. Perubahan jurang
jalur optik dan tenaga Urbach adalah disebabkan oleh perubahan struktur kaca.
Kata
kunci: Indeks biasan; jurang jalur optik; kaca borat
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*Pengarang untuk surat-menyurat;
email: halimah@science.upm.edu.my
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