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

Received: 26 April 2013/Accepted: 13 January 2014

ABSTRACT

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

REFERENCES

Abdel Baki, M. & El-Diasty, F. 2006. Optical properties of oxide glass containing transition metal. Current Opinion in Solid State and Material Science 10(5-6): 217-229.

Chimalawong, P., Kaewkhoa, J., Kedkaew, C. & Limsuwan, P. 2004. Optical and electronic polarisation of Nd³⁺ doped soda-lime silicate glasses. Journal of Physics and Chemistry of Solids 71(7): 965-970.

El-ALaily, N.A. & Mohamed, R.M. 2003. Effect of irradiation on thermal properties and density of lithium borate glass. Materials Science and Engineering B 98: 193-203.

Gayathri Pavani, P., Sadhana, K. & Chandra Mouli, V. 2011. Optical, physical and structural studies of boro-zinc tellurite glasses. Physica B 406: 1242-1247.

Hager, I.Z. 2009. Optical properties of lithium barium haloborate glasses. Journal of Physics and Chemistry of Solids 70(1): 210-217.

Halimah, M.K., Daud, W.M., Sidek, H.A.A., Zainal, A.T., Nainul, H. & Jumiah, H. 2005. Optical properties of borotellurite glasses. American Journal of Applied Sciences 63-65.

Kashif, I., Abd. El-Ghany, A., Abd El-Maboud, A., Elsherbiny, M.A. & Sanad, A.M. 2010. IR, density and DTA studies the effect of replacing Pb3O4 by CuO in pseudo-binary Li₂B₄O₇- Pb₃O₄ glass system. Journal of Alloy and Compound 503: 384-388.

Kesavulu, C.R., Chakradhar, R.P.S., Jayasankar, C.K. & Lakshmana, R.J. 2010. ERP, optical, photoluminescence studies of Cr³⁺ ion in Li₂O-_Cs2O-B₂O₃ glasses - An evidence of mixed alkali effect. Journal of Molecular Structure 975(1- 3): 93-99.

Mohapatra, S.D. 2009. FTIR analysis of Bi₂O₃-B₂O₃-Fe₂O₃ glass system doped with Nd₂O₃. Journal of Alloy and Compound 504: 234-238.

Moustafa, E.S., Saddeek, Y.B. & Shaaban, E.R. 2008. Structural and optical properties of lithium borobismuthate glass. Journal of Physics and Chemistry of Solids 69(9): 2281-2287.

Oliver, D.S. 1975. The Use of Glass in Engineering. England: Oxford University Press.

Rani, S., Sanghi, S., Argawal, A. & Seth, V.P. 2009. Study of optical band gap and FTIR spectroscopy of Li₂O.Bi₂O₃.P₂O₅ glasses. Journal of Non Crystalline Solid 74(3): 673-677.

Rockett, A. 2007. The Material Science of Semiconductor. New York. Springer-Verlag.

Saddek, Y.B., Shaaban, E.R., Moustafa, E.S. & Moustafa, H.M. 2008. Spectroscopic properties, electronic polarizability and optical basicity. Physica B 403(13-16): 2399-2407.

Subhadra, M. & Kistaiah, P. 2010. Characterisation and optical absorption studies of VO²⁺: Li₂O-K₂O-Bi₂O₃-B₂O₃ glass system. Journal of Alloy and Compound 505: 634-639.

Upender, G., Ramesh, S., Prasad, M., Sathe, V.G. & Mouli, V.C. 2010. Optical band gap, glass transition temperature and structural studies of (100-2x)TeO₂-xAg₂O-xWO₃ glass system. Journal of Alloys and Compounds 504: 468-474.

*Corresponding author; email: halimah@science.upm.edu.my