Nanostructured crystals of fluorite phases Sr{sub 1-x}R{sub x}F{sub 2+x} (R = Y, La-Lu) and their ordering: Part III. A study of the refractive indices
Journal Article
·
· Crystallography Reports
- Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)
The refractive indices n of Sr{sub 1-x}R{sub x}F{sub 2+x} crystals (R = Y, La-Lu; 0 {<=} x {<=} 0.5) have been measured at wavelengths of 0.436, 0.546, and 0.589 {mu}m. It is established that n increases when there is an increase in the RF{sub 3} content x according to a weakly quadratic law for each R. For the isoconcentration series of Sr{sub 0.9}R{sub 0.1}F{sub 2.1} 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 Sr{sub 1-x}R{sub x}F{sub 2+x} crystals. By varying the RF{sub 3} 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 RF{sub 3} crystals and low ones for crystals of alkaline earth fluorides MF{sub 2}.
- OSTI ID:
- 22050819
- Journal Information:
- Crystallography Reports, Journal Name: Crystallography Reports Journal Issue: 4 Vol. 54; ISSN CYSTE3; ISSN 1063-7745
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:22051239