【摘 要】
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The transmission spectra of cubic β-PbF2 crystals grown by the non-vacuum Bridgman method were measured with a spectrophotometer. It was found that there are
【机 构】
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Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050
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The transmission spectra of cubic β-PbF2 crystals grown by the non-vacuum Bridgman method were measured with a spectrophotometer. It was found that there are several optical absorption bands peaking at 300nm,390-400nm, as well as at 460nm. According to composition analysis, doping and annealing experiments, it is suggested that the absorption at 300nm originates from the electron transition of Ce ions from 4f → 5d. The absorption at 390-400nm may result from the colour centres related to oxygen impurities. In addition, the sample recrystallized from the coloured β-PbF2 crystal exhibits a new absorption band at 460 nm, which might be caused by trace lead vacancies.
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