X-ray-irradiated KCl:Eu2+ single crystal as a deformation-quantitative indicator sensitive to applied strain and load
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Published on: May 28, 2016
1Department of Mechanical Engineering, Saitama Institute of Technology, Fukaya, Saitama, Japan.
Abstract:
A peak (330 K peak) dependent on strains appears around 330 K on the thermoluminescence (TL) glow curve for X-ray-irradiated KCl:Eu2+ crystals, but the details of the mechanism are not clear, based on experimental results. Here, the deformation luminescence model of the 330 K peak is explored for the crystals. Bleaching with F-light, 330 K peak intensity (I 330K peak) decreases with the bleaching time as the variation of TL intensity (I F-center) due to F-centers with it. The 330 K peak relates to the F-center near the dislocation segment. The results analyzed in terms of I 330K peak and I F-center versus absorbance peak at wavelength 560 nm indicate that the captured electrons are more easily released from F-centers near the dislocation segment rather than from the isolated F-centers. Under the optical or thermal stimulus, the electrons at F-centers near the dislocation are partially released and easily migrate to trapped holes at Eu3+ ions through the dislocation line.
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