ZBLA glasses

ZBLA glass 2155 Ba35La0Al4 ZBLAN glass 2155 Ba gLagA Na y... 

Fig. 11. Crack velocity versus stress intensity factor for a ZBLA glass in different environments (Pantano...

Radiative transition probabilities, branching ratios /3, lifetimes, oscillator strengths, and peak cross sections for holmium(III) in ZBLA glass at 300 K [Reisfeld et al. (1985a) when no other reference is given]. 

Similar mutual energy transfer has also been studied (Reisfeld et al., 1986a) with neodymium(ni) and manganese(II) in ZBLA glass. Nd(III) alone not only shows the well-known luminescence from (11400cm above the ground state) to lower l levels with lifetime 0.34 ms (e.g., when excited in the yellow to C>5/2)> but also short-lived (0.02 ms) emission from (26100 cm above the ground state and 2400 cm above the closest lower /-level 05 2) and 1.5 xs from... 

Fig. 7. Luminescence and energy transfer between manganese(II) and neodymiiun-(III) in ZBLA glass (Reisfeld et al., 1986a). See also fig. 6.

From the point of view of luminescent behavior, the cascading down between eight excited /-levels of holmium(III) in ZBLA glass is one of the most spectacular effects in fluoride glasses (fig. 8). The multiphonon relaxation being... 

Fig. 8. Luminescent transitions of hoi-mium(in) in ZBLA glass (Tanimura et al., 1984 Reisfeld et al., 1985a). The J-levels known to be involved in luminescence are given to the right, the other /-levels (cf. fig. 1) to the left. The lifetimes at 300 K of the eight emitting levels are given in (is (cf. table 3).

Corrosion layers formed on ZBLA glass (From D. G. Chen, Graduate Thesis, University of Florida, 1987, p. 101). (a) the two kinds of precipitates, (b) the bulk glass, transform layer, and precipitate layer. 

Transform layer thickness versus corrosion time for ZBLA glass during stagnant test. 

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