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