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Structural and Optical Properties of Lead-Boro-Tellurrite Glasses Induced by Gamma-Ray
School of Physics, Universiti Sains Malaysia, 11800 Minden, Pulau Pinang, Malaysia
Physics Department, Faculty of Science, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia
* Author to whom correspondence should be addressed.
Received: 25 October 2012; in revised form: 9 January 2013 / Accepted: 12 January 2013 / Published: 4 February 2013
Abstract: Spectrophotometric studies of lead borotellurite glasses were carried out before and after gamma irradiation exposure. The increasing peak on the TeO4 bi-pyramidal arrangement and TeO3+1 (or distorted TeO4) is due to augmentation of irradiation dose which is attributed to an increase in degree of disorder of the amorphous phase. The structures of lead tellurate contain Pb3TeO6 consisting of TeO3 trigonal pyramid connected by PbO4 tetragonal forming a three-dimensional network. The decrease of glass rigidity is due to irradiation process which is supported by the XRD diffractograms results. The decreasing values of absorption edge indicate that red shift effect occur after irradiation processes. A shift in the optical absorption edge attributed to an increase of the conjugation length. The values of optical band gap, Eopt were calculated and found to be dependent on the glass composition and radiation exposure. Generally, an increase and decrease in Urbach’s energy can be considered as being due to an increase in defects within glass network.
Keywords: tellurite glass; optical band gap; Urbach’s energy; irradiation
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Mustafa, I.S.; Kamari, H.M.; Yusoff, W.M.D.W.; Aziz, S.A.; Rahman, A.A. Structural and Optical Properties of Lead-Boro-Tellurrite Glasses Induced by Gamma-Ray. Int. J. Mol. Sci. 2013, 14, 3201-3214.
Mustafa IS, Kamari HM, Yusoff WMDW, Aziz SA, Rahman AA. Structural and Optical Properties of Lead-Boro-Tellurrite Glasses Induced by Gamma-Ray. International Journal of Molecular Sciences. 2013; 14(2):3201-3214.
Mustafa, Iskandar S.; Kamari, Halimah M.; Yusoff, Wan M.D.W.; Aziz, Sidek A.; Rahman, Azhar A. 2013. "Structural and Optical Properties of Lead-Boro-Tellurrite Glasses Induced by Gamma-Ray." Int. J. Mol. Sci. 14, no. 2: 3201-3214.