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|Title:||Thermoluminescence characteristics of natural kyanite — A study on non pre-heated and pre-heated sample|
Kalita, J M
Order of kinetics
|Abstract:||Thermally stimulated luminescence (TSL) of X-ray irradiated natural kyanite in the form of micro-grain powder at room temperature has been studied under non pre-heated and pre-heated conditions. The order of kinetics, activation energy and pre-exponential frequency factor has been investigated. TSL peaks are shown at temperatures 116.42, 125.46, 131.75 and 135.79oC for non pre-heat kyanite and at 134.79, 144.50, 150.60 and 154.85oC for pre-heated kyanite at their respective heating rates 2, 4, 6 and 8°C/s. XRD report shows excellent data and confirmed to be purely crystalline in nature. Compositional and elemental analysis of kyanite powder have been done by XRFS and EDXS and found to be a purity of grade III specification. From the shape of the TL glow curve, it is found to be first order kinetics in both cases. The activation energy and pre-exponential frequency factor have been calculated as (0.93±0.03) eV and (9.51±0.19)×1010 s-1 for non pre-heated kyanite, respectively and for pre-heated kyanite, these values are (0.96±0.05) eV and (1.22±0.59)×1011 s-1, respectively.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.50(08) [August 2012]|
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