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- Title
Nanostructured crystals of fluorite phases Sr<sub>1 − x</sub> R<sub> x</sub>F<sub>2 + x</sub> ( R = Y, La-Lu) and their ordering: Part III. A study of the refractive indices.
- Authors
Glushkova, T.; Karimov, D.; Krivandina, E.; Zhmurova, Z.; Sobolev, B.
- Abstract
The refractive indices n of Sr1 − x R xF2 + x crystals ( R = Y, La-Lu; 0 ≤ x ≤ 0.5) have been measured at wavelengths of 0.436, 0.546, and 0.589 μm. It is established that n increases when there is an increase in the RF3 content x according to a weakly quadratic law for each R. For the isoconcentration series of Sr0.9 R0.1F2.1 crystals, the change in n in the series of rare earth elements has a pronounced nonlinear character, which reflects the nonmonotonous change in the properties of compounds in the R series. It is shown that the method of molecular refraction additivity can be used to calculate n for Sr1 − x R xF2 + x crystals. By varying the RF3 content in them, one can obtain optical media with a gradually varied refractive index n in the range 1.44–1.55, thus filling the gap in the n values between high ones for RF3 crystals and low ones for crystals of alkaline earth fluorides MF2.
- Subjects
NANOSTRUCTURED materials; CRYSTALS; FLUORITE; WAVELENGTHS; OPTICAL measurements; ALKALINE earth chlorides
- Publication
Crystallography Reports, 2009, Vol 54, Issue 4, p603
- ISSN
1063-7745
- Publication type
Article
- DOI
10.1134/S1063774509040105