Optical Studies on Electrolytically Colored CaF<SUB>2</SUB> Crystals

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  • Optical studies on electrolytically colored CaF2 crystals

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Synthetic crystals of CaF2 were electrolytically colored at voltages up to 5 kv and at temperatures from room temperature to 345°C. Dielectric breakdown figures and dislocation lines were visualized by colloidal Ca metal which preferentially precipitated during the electrolysis. The preferred orientations were distinguished on ⟨1\bar10⟩ and ⟨11\bar2⟩ in the figures and in etch pit configurations. The glide in CaF2 crystal structure was concluded to be in {110} with Burgers vector (Remark: Graphics omitted.) as had been expected. Four absorption bands were observed at 576, 396, 332 and 223 mμ with the absence of 375 mμ band which has been believed to be F band. In addition, the colored crystals exhibited red and blue luminescences by 580 and 400 mμ excitations respectively. The absorption centers in the electrolytically colored CaF2 crystal are suggested to be connected closely with impurity.

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