Effect on thermoluminescence parameters of biotite mineral due to thermal quenching

The Thermally Stimulated Luminescence (TSL) at room temperature X-ray irradiated natural biotite in form of micro-grain powder was studied under various heating rates. TSL peaks showed at temperatures 393K, 399.6K, 403.5K, 404.5K, 406.9K at their respective heating rates 2K/s, 4K/s, 6K/s, 8K/s and 1...

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Bibliographic Details
Published in:Journal of luminescence 2012-11, Vol.132 (11), p.2952-2956
Main Authors: Kalita, J.M., Wary, G.
Format: Article
Language:English
Subjects:
Activation energy
Biotite
Earth sciences
Earth, ocean, space
Electron traps
Exact sciences and technology
Glow curves
Heating rate
Luminescence
Mathematical analysis
Mineralogy
Quenching
Silicates
Symmetry
Symmetry factor
Thermal quenching
Thermoluminescence
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Summary:The Thermally Stimulated Luminescence (TSL) at room temperature X-ray irradiated natural biotite in form of micro-grain powder was studied under various heating rates. TSL peaks showed at temperatures 393K, 399.6K, 403.5K, 404.5K, 406.9K at their respective heating rates 2K/s, 4K/s, 6K/s, 8K/s and 10K/s. The effect of thermal quenching on thermoluminescence parameters such as peak maximum temperature, peak area, FWHM, geometrical symmetry factor, the activation energy were investigated. From the symmetry factor it is clear that the TL glow curve follows the first order kinetics for the lowest heating rate, but as the heating rate increases it defers from the first order. The activation energies for each heating rates were calculated by using Chen peak shape methods for general order kinetics and found to be decreased for higher heating rates. When activation energy is calculated by variable heating rate method it is observed that the method overestimated the value of activation energy and pre-exponential frequency factor significantly due to thermal quenching. ► Biotite is a common mineral with chemical formula K(Mg,Fe)3AlSi3O10(F,OH)2. ► Structural, compositional and elemental analysis of biotite is carried out. ► TSL of X-ray irradiated natural biotite was studied under various heating rates. ► The effect of thermal quenching on TL parameters has been investigated.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2012.06.009