Solid State Science and Technology, Vol. 15, No 1 (2007) 191-202

ISSN 0128-7389

 

191

STUDIES ON GAMMA IRRADIATED SODIUM TETRABORATE

GLASSES CONTAINING YTTERBIUM

A. A. Kutub, M. S. Elmanhawaawy and M.O. Babateen

Department of Physics, Faculty of Applied Sciences, Umm AL Qura

University, P.O. Box 253, Makkah AL Mukkaramah , Saudi Arabia .

 

ABSTRACT

A series of glass samples of (Na2 B4 O7)100-x (Yb2 O3)x were prepared by the usual melt quenching technique where x varied from 0 to 5 mol % .Optical absorption spectra were measured before and after gamma- irradiation of the glasses. Gamma-irradiation causes a shift of the fundamental absorption edge to longer wavelengths and induces a new absorption band around 550 nm for all glass compositions. The position of this band remains unaltered by increase in either the Yb2O3 content or the gamma-dose. A second band at 360 nm only appears for glasses doped with Yb2O3; its position remains unaffected by a storage time of 2500 h. The radio-thermoluminescence (RTL) curve for the base glass (Na2 B4O7) shows two peaks around 90 oC and 200 oC. The inclusion of

Yb2O3 in the base glass causes a gradual suppression of the low temperature peak with increasing Yb2O3 concentration. At 4 mol% Yb2O3, it disappears and the RTL curve subsumes a single well-defined peak at high temperatures. The RTL peaks tend to shift to higher temperatures with increase in Yb inclusions.

 

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