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Growth of R 1 ? y Sr y F3 ? y 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:E A Krivandina  Z I Zhmurova  B P Sobolev  T M Glushkova  D F Kiselev  M M Firsova  A P Shtyrkova
Institution:(1) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiĭ pr. 59, Moscow, 119333, Russia;(2) Moscow State University, Vorob’evy gory, Moscow, 119899, Russia
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.
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