Optical Absorption Study on the Conversion and Restoration of Color Centers in Pure KCI Crystals |
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| Authors: | Yin-Fu Xu Yun-Cheng Ge Li Zhu Cheng-Xiang Guan |
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| Institution: | 1. Department of Physics , Harbin Normal University , Harbin, 150080, China;2. Department of Physics , Harbin Normal University , Harbin, 150080, China;3. National Laboratory of Solid State Microstructures , Nanjing University , Nnajing, 210008, China;4. Department of Physics , Jilin Teacher's College , Jilin City, 132000, China |
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| Abstract: | The conversion and restoration processes of colour centers in pure KCI crystals were studied by optical absorption measurements. When the sample is heated the aggregative centers in it begin to dissolve to F centers, and the opposite process will take place, i.e. F centers will aggregate to form F2, F3, F4centers if the samples are cooled down. It was found that the conversion and restoration processes are dependent on the annealing temperature and time. In our experiment, the samples were treated at various temperatures and time. In addition the restoration process for the 350°C treated sample was studied live. We found that the higher the annealing temperature is the slower the restoration in the samples proceed, and the conversion process maintained for a few minutes even after annealing treatment. |
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| Keywords: | KCI crystals conversion and restoration of colour centers optical absorption |
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