EFFECT OF MONO-AND TRIVALENT CATIONS ON COLOR CENTERS IN CALCIUM FLUORIDE. Technical Report 147
Technical Report
·
OSTI ID:4138039
Coloration of pure CaF/sub 2/ crystals with 2.5-Mev electrons at room temperatare gives four bands located at 580, 400, 335. and 225 M mu . Low- temperature (-- 190 deg C) coloration, however, yields different bands, located at 545, 320, and 275 m mu . In YF/sub 3/-doped crystals the bands are in the same spectral positions as in pure crystals. They are, however, enhanced, and at room temperature their intensity ratios are significantly changed, the 400-m mu band being predominant. NaF-doped crystals show an even more drastic change. Coloration at room temperature produces bands at bands at 440, 390, 315, and 200 m mu . The coloration in NaFdoped crystals is deeper than in either pure or YF/ sub 3/-doped crystals. Several explanations for the modification of the color- center spectra by doping are possible: in YF/sub 3/-doped crystals, interstitial F/sup -/ ions may act as a source of electrons and holes and/or induce vacancy formation through lattice distortion; and in NaF-doped crystals, F- vacancies may act as traps and/or enhance oxygen contamination by diffusion. (auth)
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge. Lab. for Insulation Research
- NSA Number:
- NSA-14-016075
- OSTI ID:
- 4138039
- Report Number(s):
- NP-8689
- Country of Publication:
- United States
- Language:
- English
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