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IJPAP Vol.47(06) [June 2009] >

Title: Trap spectroscopy of microcline in the temperature range 77-600 K
Authors: Singh, K Bishal
Ahmed, A B
Gartia, R K
Keywords: Trap spectroscopy
Issue Date: Jun-2009
Publisher: CSIR
Abstract: Trap spectroscopy of microcline (KAlSi3O8) has been determined by deconvoluting two monochromatic (435 and 285 nm) glow curves. Unlike most studies performed in the range LNT to RT and RT to 400°C separately, in this work thermal scan of the trapping levels has been done right from LNT (77 K) to 600 K. As many as 15 trapping levels could be identified. The most remarkable finding of this analysis is that in microcline, practically all the glow peaks follow second order kinetics, a point that will be discussed critically. For 77K to RT, the frequency factor (s) lies in the range 105 ≤ s ≤108 while in the range RT and 300°C, it lies in the range 107≤ s ≤1012. E ~ Tm plot both for UV and blue emission fit to similar equations;

Eblue=0.12 exp (0.0045 Tm) …(1)
EUV=0.11 exp (0.0049 Tm) …(2)

The lifetime (t) of electrons trapped in the trap of depth 1.5 eV (300°C glow peak) is more than 107 years justifying the use of feldspar in long range dating.
Page(s): 406-408
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.47(06) [June 2009]

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