ブリッジマン法によるハロゲン化アルカリ固溶体単結晶の作製とその性質

概要

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End member and solid-solution single crystals of alkali halides were prepared by Bridgman method, using sodium chloride (NaCl), potassium chloride (KCl), sodium bromide (NaBr) and potassium bromide (KBr). Transparent and crack-free specimen was obtained in each end member single crystal. As a result of X-ray diffraction experiment in solid-solution single crystals, It was found that maximum content is 20 to 25 mass%. Lattice parameter in each solid-solution single crystal was satisfied with Vegard's law. The solid-solution single crystals wothout cracks also were obtained in wider solid-solution region in anion (Cl^- or Br^-)-replacement type than in cation (Na^+ or K^+)-replacement type. This result in cation-replacement appears to be attributed to difference between two cationic radii. Single crystal in KBr-KCl system indicated increment of Vickers hardness with adding the alkali halide. On the other hand, in NaBr-NaCl system, adding NaBr to NaCl caused solid-solution hardening, while adding NaCl to NaBr caused solid-solution softening. Curves of density and refractive index versus the content had a downward convex shape. This result corresponds to Lorentz-Lorenz relationships, which connects density with refractive index.
社団法人日本セラミックス協会の論文
1995-08-01