Ba(B0.5Ta0.5)O3 Ordered Perovskite-Type Compounds, Possible New Laser Host Materials

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Abstract
The trivalent ions of Nd, Sm, and Yb were incorporated into powders of ordered perovskite‐type compounds having the general formula Ba(B0.5Ta0.5)O3, where B is a trivalent rare‐earth cation, In3+, Y3+, or Sc3+. Fluorescent lifetimes measured employing these materials indicate that the lifetimes for Nd3+fluorescence are not as dependent on crystalline field as those for Cr3+fluorescence. Of the Nd3+‐doped phases studied, Ba(Gd0.48Nd0.02Ta0.5)O3 and Ba(Lu0.48Nd0.02Ta0.5)O3 were found to exhibit the longest lifetimes (800 and 850 μsec, respectively, at 77°K). Preliminary studies show that single crystals of Ba(Y0.5Ta0.5)O3 can be grown from a B2O3 flux by slow cooling or by a modified Czochralski technique. Developing crystals of suitable quality for laser studies, however, requires further research.