COLORATION OF YTTRIUM-DOPED CaF$sub 2$ AND SrF$sub 2$ CRYSTALS BY X-RAY IRRADIATION
Journal Article
·
· Physica Status Solidi (East Germany) Divided into Phys. Status Solidi A and Phys. Status Solidi B
CaF/sub 2/ and SrF/sub 2/ crystals were doped with trivalent yttrium ions, and x-irradiated, which resulted in similar coloration spectra for both substances. The bands seemed to satisfy Mollwo's relation nu a/sup 2/ = const, since the SrF/sub 2/ hands were shifted to longer wavelengths compared with fhe corresponding CaF/sub 2/ bands. The absorption spectra were interpreted in terms of the 4d electrons of the bivalent yttrium ions, whose formation was explained by spectra of the CaF/sub 2//Y crystals were identical with the fourabsorption- band spectra of natural crystals or synthetic p crystals grown from natural material. This supports strongly the assumption that the four-absorption- band spectra in natural CaF/sub 2/ is produced by yttrium impurities; this however invalidates hypotheses according to which the four-absorption-band spectrum of CaF/sub 2/, obtained after irradiation, is typical of intrinsic lattice imperfections in alkaline earth fluorides. (auth)
- Research Organization:
- Originating Research Org. not identified
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-018146
- OSTI ID:
- 4713491
- Journal Information:
- Physica Status Solidi (East Germany) Divided into Phys. Status Solidi A and Phys. Status Solidi B, Journal Name: Physica Status Solidi (East Germany) Divided into Phys. Status Solidi A and Phys. Status Solidi B Vol. Vol: 3; ISSN PHSSA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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