Ions Nd3 Research Articles

Approximate Analytical Wavefunctions for Certain States of Nd3 +

Approximate analytical self-consistent field wavefunctions were calculated for the ground state and for certain excited states of the laser-active ion Nd3 +. The following states of the 4f3 configuration of Nd3 + were covered by our calculations: S4,D4,F4,G4,, and I4. For the purpose of this work we combined the minimum and the saturated basis set approximations. All the orbital exponents were accurately optimized. The d orbitals, and particularly the 4f orbital, were calculated unusually accurately. Except the optically unaffected orbitals 1s, 2s, and 2p, all the orbitals of the s, p, d, and f symmetries exhibited zero deviation (to five decimals) from the tail nodal extinction. The virial theorem was always satisfied to at least five significant figures.

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

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.

Rolling friction at high speed : T. Sasaki and N. Okino, Bull. JSME, 5 (18) (1962) 360–373

Mixed hydrothermal system H2O–OA (EDA)–O-A(LO-A) is developed to synthesize barium rare earth fluorides nanocrystals (OA = oleylamine, EDA = ethylenediamine, O-A = oleic acid and LO-A = linoleic acid). They are presented as BaREF5 (RE = Ce, Pr, Nd, Eu, Gd, Tb, Dy, Y, Tm, Lu) and Ba2REF7 (RE = La, Sm, Ho, Er, Yb). The influence of reaction parameters (rare earth species, hydrothermal system and temperature) is checked on the phase and shape evolution of the fluoride nanocrystals. It is found that reaction time and temperature of these nanocrystals using EDA (180 °C, 6 h) is lower than those of them using OA (220 °C, 10 h). The photoluminescence properties of these fluorides activated by some rare earth ions (Nd3+, Eu3+, Tb3+) are studied, and especially up-conversion luminescence of the four fluoride nanocrystal systems (Ba2LaF7:Yb, Tm(Er), Ba2REF7:Yb, Tm(Er) (RE = Gd, Y, Lu)) is observed.

Paramagnetic Scattering of Neutrons by Trivalent Ions of Nd and Er

Paramagnetic Scattering of Neutrons by Trivalent Ions of Nd and Er