Abstract
In growth zones of synthetic quartz samples, BTL (blue-thermoluminescence) intensities were found to gradually decrease with Al-impurity concentrations beyond 13 ppm, except for - X zones. This tendency suggests the relevance of other impurities, which were identified by infrared (IR) spectrometry. In the IR spectrum, + X zones indicated a negative relationship between BTL and Al–OH absorbance, whereas the - X zones showed extremely weak BTL and high Al–OH absorbance. On the basis of low-temperature measurements we suggest that hydrogen radicals and other radicals due to OH or water molecule impurities cause the elimination of BTL-centers and that the BTL sensitivity of quartz at environmental temperature is influenced not only by Al-impurities, but also by OH groups and other types of center.
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