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JOURNAL OF SYNTHETIC CRYSTALS ›› 2023, Vol. 52 ›› Issue (4): 571-577.

• Research Articles • Previous Articles     Next Articles

Effect of Trace La Impurities on the Spectral Properties of CaF2 Crystals with γ-Irradiation Induced Color Centers

WANG Donghao1,2,3, KOU Huamin3, SHAO Chongyun4, JIANG Dapeng3, ZHANG Bo3, WANG Jingya3, QIAN Xiaobo3, ZHANG Zhonghan3, WU Qinghui3, SU Liangbi1,2,3   

  1. 1. School of Rare Earths, University of Science and Technology of China, Hefei 230026, China;
    2. Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China;
    3. Shanghai Institute of Ceramics, Chinses Academy of Sciences, Shanghai 201899, China;
    4. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2023-01-10 Online:2023-04-15 Published:2023-04-28

Abstract: The resistance of calcium fluoride crystals to γ-irradiation is one of the key properties for its application in space. In this paper, the effect of trace La impurities on the γ-irradiation induced color center of calcium fluoride crystals was reported. The calcium fluoride crystals with trace La impurities were studied by absorption spectroscopy and electron paramagnetic resonance (EPR). The results show that the irradiated calcium fluoride crystals produce multiple color center absorption bands, and the absorption band increases with the increase of irradiation dose and the concentration of La impurities. EPR confirms that the formation of this absorption band is caused by the F color center in the calcium fluoride crystal. The presence of La3+ affect the stability and spectral position of the F centers in calcium fluoride crystals. Possible mechanisms for the presence of La3+ and F centers in calcium fluoride crystals are proposed.

Key words: CaF2 crystal, color center, γ-irradiation, La impurity, trace

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