RESEARCH PROGRAM ON NEW PEROVSKITE LASER HOST MATERIALS OF THE A(B'0.5 B''0.5) O3-TYPE HAVING CUBIC CENTROSYMMETRIC LATTICE SITES
Final rept. for 1 Aug 1964-31 Jul 1965
UNITED AIRCRAFT RESEARCH LABS EAST HARTFORD CT
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Powders of perovskite-type compounds having the general formula BaB0.5 Ta0.503, where B is a trivalent rare earth cation, In3, Y3, or Sc3, were doped with trivalent laser activating ions and the fluorescent lifetimes were measured. The values obtained, i.e. 850 micro-sec for Nd3 doped BaLu0.5 Ta0.503, 800 micro-sec for Nd3 doped BaGd0.5 Ta0.503, and the long lifetimes obtained for other rare earth doped phases of this type indicate that some of them may make promising laser materials. In addition, the optical properties of a number of other complex perovskite phases and some non- perovskite phases were measured. Studies involving flux growth crystals were also made during this period. In the first investigations, small, discolored crystals of BaLa0.5 Ta0.503, BaGd0.5 Ta0.503, BaLu0.5 Ta0.503, BaSc0.5 Ta0.503 and BaY0.5 Ta0.503 were grown from a BaF2 flux. After detailed phase diagram studies of the Ba0YTa04-B2O3 and Ba0-LuTaO4-B2O3 systems, clear single crystals of doped BaY0.5 Ta0.5O3 and BaLu0.5 Ta0.5O3 were grown from a B2O3 flux by slow cooling. In addition, a larger single crystal of BaY0.5 Ta0.5O3 was grown by a modified Czochralski technique.
- Inorganic Chemistry