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Structural and optical properties of lead-boro-tellurrite glasses induced by Gamma-ray.


Mustafa, Iskandar Shahrim and Mohamed Kamari, Halimah and Wan Yusoff, Wan Mohamad Daud and Abd. Aziz, Sidek and Abdul Rahman, Azhar (2013) Structural and optical properties of lead-boro-tellurrite glasses induced by Gamma-ray. International Journal of Molecular Sciences, 14 (2). pp. 3201-3214. ISSN 1661-6596; ESSN: 1422-0067


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.

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Official URL or Download Paper: http://www.mdpi.com/1422-0067/14/2

Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.3390/ijms14023201
Publisher: Multidisciplinary Digital Publishing Institute
Keywords: Irradiation; Optical band gap; Tellurite glass; Urbach's energy.
Depositing User: Umikalthom Abdullah
Date Deposited: 30 May 2014 01:25
Last Modified: 07 Oct 2015 08:25
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/ijms14023201
URI: http://psasir.upm.edu.my/id/eprint/29992
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