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- Title
Growth of R <sub>1 − y </sub>Sr<sub> y </sub>F<sub>3 − y </sub> crystals with rare earth elements of the cerium subgroup ( R = La, Ce, Pr, or Nd; 0 ≤ y ≤ 0.16) and the dependence of their density and optical characteristics on composition
- Authors
Krivandina, E. A.; Zhmurova, Z. I.; Sobolev, B. P.; Glushkova, T. M.; Kiselev, D. F.; Firsova, M. M.; Shtyrkova, A. P.
- Abstract
Crystals of the R 1 − y Sr y F3 − y phases ( R = La, Ce, Pr, or Nd; 0 ≤ y ≤ 0.16) with tysonite (LaF3) structure are grown by the Bridgman method. A linear dependence of the crystal density on the SrF2 concentration has been revealed for each series of solid solutions. A scheme of heterovalent isomorphous substitution in the tysonite structure, R 3+ + F1− → M 2+ + V F, with compensation of the difference in the cation charges due to the formation of anion vacancies, is confirmed experimentally. The optical transmission spectra are measured in the wavelength range λ = 2.18–22.22 μm. It is shown that the 50%-transmission edge in the IR range is 10.5 μm for all crystals. The refractive index and the polarizability of crystals decrease with decreasing SrF2 content according to a linear law. The melting curves of the R 1 − y Sr y F3 − y phases studied have a maximum; therefore, these phases can be recommended for use as crystals with a high homogeneity and different optical properties in comparison with the corresponding RF3 crystals.
- Subjects
CRYSTAL growth; RARE earth metals; TYSONITE; CRYSTAL optics; REFRACTIVE index
- Publication
Crystallography Reports, 2006, Vol 51, Issue 5, p895
- ISSN
1063-7745
- Publication type
Article
- DOI
10.1134/S106377450605021X